31 is for his 31 career Grand Slam finals, the second-most for a man in tennis history after Djokovic’s 35. Federer went 20-11 in his 31.
32 is for 32% of first serve return points won in his career, and it’s not far off being rounded to 33% (it’s actually 32.49%). He won 24,113 of the 74,206 first serve return points he ever played.
33 is for his 33 career wins in five-setters, tied with Sampras for fifth-most in the Open Era after Ilie Nastase (42), Djokovic (37), Lendl (36) and Marin Cilic (34).
34 is for when he won 34 sets in a row at Wimbledon, the longest consecutive set streak for a man in the tournament’s history, and he actually did it twice, from the third round in 2005 to the final in 2006 and from the first round in 2017 to the quarterfinals in 2018.
35 is for winning 35 matches in a row in 2005, the second-longest winning streak of his career, which brought him titles at Halle, Wimbledon, Cincinnati, the US Open and Bangkok before David Nalbandian finally snapped it in the final of the ATP Finals.
36 is for reaching 36 consecutive Grand Slam quarterfinals, between Wimbledon in 2004 and Roland Garros in 2013. It’s the longest Grand Slam quarterfinal streak for a man in tennis history.
37 is for his age when he won his 28th and final Masters 1000 title at Miami in 2019. That’s still the record for oldest player ever to win a Masters 1000 event.
38 is for his age when he won his 103rd and final ATP title at Basel in 2019. He has the second-most career ATP titles in the Open Era (after Connors’ 109).
39 is for his age when he played the final singles match of his career at Wimbledon in 2021, falling to Hubert Hurkacz in the quarterfinals. His final tour-level match, period, came in doubles at the Laver Cup in 2022—41 at the time, he partnered Nadal and fell to Jack Sock and Frances Tiafoe in a nail-biter.
40 is for his 40-match winning streaks at Wimbledon (2003 to 2008) and the US Open (2004 to 2009). His Wimbledon winning streak is the second-longest for a man in the Open Era (after Borg’s 41 in a row from 1976 to 1981) and his US Open winning streak is actually the longest in the Open Era for any player, male or female.
41 is for his career-best 41-match winning streak between 2006 and 2007, which included his last 29 matches of 2006 (bringing him titles at the US Open, Tokyo, Madrid, Basel and the ATP Finals) and his first 12 matches of 2007 (bringing him titles at the Australian Open and Dubai). His streak was snapped in his opening match at Indian Wells by Guillermo Canas.
And finally, 42 is for Federer winning his record-breaking 42nd consecutive match on grass in the first round of Wimbledon in 2006, with a 6-3, 6-2, 6-2 victory over Richard Gasquet. With that victory, he surpassed Borg for longest grass-court winning streak for a man in the Open Era, a record that still stands strong.
“It’s nice to get any streak,” he said afterwards. “I’m still going, so even better if I can maybe postpone it and make it even last longer.”
He would eventually extend the streak to a ridiculous 65 in a row before Nadal finally snapped it in the 2008 Wimbledon final.