On 14 August 1971, 20-year old striker Kenny Dalglish scored his first competitive goal to help Celtic past Rangers in the Scottish League Cup.
Dalglish (pictured, top left) started his professional career with Celtic in 1968, but made only nine total appearances in his first three seasons. But he impressed manager Jock Stein in a friendly played in May 1971, scoring six times in Celtic's 7-2 win.
Stein rewarded Dalglish with an appearance in their opening match of the Scottish League Cup, played at home against rivals Rangers (who had beaten Celtic in the tournament final the previous season) and Dalglish justified the decision by scoring from the penalty spot in Celtic's 2-0 victory.
Celtic went on to reach the final, where they lost to Partick Thistle. But they won the league for the sixth straight season (and would go on the win it the next three seasons as well). Dalglish provided a total of 23 goals that season en route to a grand total of 167 in his Celtic career, which ranks him 10th on the club's list of all-time scorers.
Before he retired in 1990, Dalglish amassed a total of 366 goals for Celtic, Liverpool, and Scotland. In 2009, FourFourTwo magazine named him British football's greatest post-war striker.
On 13 August 2006, the longest football match in United States history ended after 100 hours of continuous play.
Hosted by MLS club Chivas USA in honor of the 100th anniversary of their parent club, CD Guadalajara, the match consisted of a Chivas side taking on a "Rest of the World" team. Played at the Bell Gardens Sports Center in California, it began on Wednesday, 9 August and continued for 6,000 straight minutes.
Over 2,000 players participated in the match, including former professionals, team officials, local politicians, and even members of the Chivas USA dance team, the ChivaGirls. The last hour saw appearances from Guadalajara president Jorge Vergara, Chivas USA president Antonio Cué, Guadalajara's all-time leading scorer Salvador Reyes, and actress Kate del Castillo.
The Chivas side won the match by the relatively close score of 437-429, with proceeds from the match going to Chivas USA's charitable foundation.
On 12 August 1970, two French clubs merged to form a new team. Known as Paris Saint-Germain, it is now the longest-tenured club in Ligue 1 and was the first French team to win a major European trophy.
The merger was the result of a push to bring a top-level club to the capital. At the time, no club from the city had won Division One since RC Paris did it in 1936 (and they were from the suburb of Colombes) and no team had even finished in the top half of the Division 1 table since RC Paris finished second in 1961. But RC Paris had since fallen out of the top-flight, leaving perennial strugglers Red Star FC as the city's only Division 1 club.
The proponents of a new team started by creating a shell club called Paris FC in 1969 and quickly started looking to flesh it out through a merger with another club. They eventually settled on Stade Saint-Germain, a club from a nearby suburb that had been founded in 1904 and had just won promotion to Division 2 for the 1970-71 season.
Taking Saint-Germain's league spot, the newly-combined PSG won promotion to Division 1 in their first season, but struggled to a 16th place finish in 1972. After that second season, tensions arose over the fact that the "Saint-Germain" in the team's name was not strictly part of the capital. The club split, with Paris FC splintering off and keeping the team's position in the top flight, while the still-named PSG assumed amateur status and dropped down to the third division. By 1974, however, PSG returned to Division 1 while Paris FC had fallen into Division 2. PSG have remained in the top flight ever since.
They took their first Division 1 title in 1986 and added another in 1994. They are currently on a four-season streak, winning the league in 2013, 2014, 2015, and 2016.
On 11 August 2008, the Los Angeles Galaxy made changes at the top of their organization, accepting the resignation of manager Ruud Gullit and sacking general manager Alexi Lalas.
Lalas had held the general manager position since April 2006, when he moved to LA from the New York Red Bulls. He was instrumental in signing midfielder David Beckham from Real Madrid for a 5-year deal worth $32.5 million. Beckham arrived in July 2007 and Gullit followed shortly afterward.
The former AC Milan star joined LA in November 2007 on a three-year deal with an annual salary of $2 million making him the highest-paid coach in the league at the time. His credentials included short stints at Chelsea (1996-98), Newcastle (1998-99), and Feyenoord Rotterdam (2004-05).
The investments prompted many to tip the Galaxy as title contenders for 2008, but their performance on the pitch was poor. They hovered near the bottom of the Western Conference for most of the 2008 season and suffered through a seven-match winless streak that ended with the departure of Gullit and Lalas. The club brought former US national team manager Bruce Arena in for the 2009 season, which ended with the Galaxy at the top of the Western Conference and runners-up in the MLS Cup Final.
Lalas went on to become an analyst and commentator for ESPN, ABC, and Fox while Gullit served for six months as the manager of Russian Premier League club Terek Grozy before getting sacked in June 2011.
On 10 August 1971, former Manchester United and Republic of Ireland captain Roy Keane was born in Cork. A tenacious central midfielder, he was known for his competitive spirit both on and off the pitch.
He began his career with Cobh Ramblers (1989-90) and Nottingham Forest (1990-93), but spent the majority of his career at Manchester United where he played from 1993 to 2005. United paid a then-record British transfer fee of £3.75 million to sign him from Forest and Keane delivered instantly, scoring a brace in his Old Trafford debut, a 3-0 victory over Sheffield United. That first season, United went on their first league and FA Cup double.
He would go on to win seven league titles, four FA Cups, and the Champions League with United, but his success on the pitch was often overshadowed by his temper, with Keane receiving a total of 11 red cards during his time with United, often for violent conduct. In a 2001 match against Manchester City, Keane was ejected for brutally tackling Alf-Inge Haaland. He later revealed in his autobiography that the challenge had been an intentional retaliation for a dust-up the two had had in a previous match. The admission resulted in a further 5-match ban and a fine of £150,000.
Keane left United in 2005 after several public disagreements with his teammates and manager Alex Ferguson. He moved to Celtic, but made only 13 appearances for them before retiring in 2006.
He turned to management later that year and has helmed Sunderland (2006-08) and Ipswich Town (2009-11). In 2013, he became an assistant with the Republic of Ireland.
On 9 August 1931, future Brazilian legend Mário Zagallo was born in Maceió. He went on to become the first person to win the World Cup as a player and a manager.
Nicknamed "the Professor," he spent his entire club career in Brazil, first with Rio de Janeiro club America FC (1948-49), then with Flamengo (1950-58) and Botafogo (1958-65). Although small at 1.67 meters (5'5"), he was a skilled midfielder with an instinct for the attack and a willingness to race back on defense. He rose to international fame with Brazil in 1958 when he played every minute of their World Cup campaign and scored in their 5-2 victory over Sweden in the final. He repeated that performance in 1962 as Brazil lifted their second World Cup.
He retired as a player in 1965, but took up management one year later, starting with Botafogo. He briefly managed Brazil in 1967-68, then returned in 1970 in time for the World Cup. Although his style was criticized as too rigid and defensive, his Brazil squad won all six matches, including the final over Italy, to make Zagallo the first man in history to win the tournament as a player and a manager (to date, only Franz Beckenbauer has matched that accomplishment).
After taking Brazil to a fourth-place finish in 1974, Zagallo left the national team and began a coaching journey that took him across Brazil and the Middle East. He returned to the national team in 1994 as an assistant to Carlos Alberto Parreira and again Brazil took the trophy. He replaced Parreira in 1998 and guided Brazil to another World Cup Final, but lost to France.
He retired in 2001, but remains a constant presence around the Brazilian national team.
On 8 August 2009, Lazio defeated Inter in the Supercoppa Italiana. As it turned out, it was the only competition Inter entered that season that they didn't win.
Established in 1988, the Suppercoppa Italiana pits the previous season's Serie A winners against the Coppa Italia holders. For 2009, those teams were Inter and Lazio, respectively. At the time, they both had won the competition four times and had even met in the 2000 edition, which Lazio won 4-3 (Inter participated that year as Coppa Italia runners-up, since Lazio had done the double the previous season).
Played at the Bird's Nest in Beijing, Inter looked the better of the two sides, with several close chances from new signing Samuel Eto'o. But Lazio were the ones to take the lead when their Brazilian midfielder Matuzalem knocked the ball home in the 63rd minute. They doubled their lead just three minutes later when captain Tommaso Rocchi (pictured) scored with a chip.
Eto'o finally found the back of the net in the 75th minute, but Diego Milito's apparent equalizer shortly afterward was ruled to be offside, so the match ended as a 2-1 Lazio victory. Inter earned some consolation, however, by winning that season's Serie A title, as well as the Coppa Italia and the Champions League.
On 14 August 1971, 20-year old striker Kenny Dalglish scored his first competitive goal to help Celtic past Rangers in the Scottish League Cup. 
