5 players Federer has met in the highest number of different tournaments

#2 Lleyton Hewitt - 16 tournaments

Hewitt (left) and Federer

Lleyton Hewitt is the fourth player Federer has faced off against in exactly 16 different tournaments, with the Swiss player leading the pair's head-to-head 18-9.

Federer and Hewitt have clashed at 3 of the 4 Grand Slam tournaments (never met at Roland Garros), the ATP Finals, 6 different Masters 1000 tournaments (Hamburg was a Masters 1000 tournament in 2004), Davis Cup and 5 other tournaments.

Federer went 3/5 in tournament finals against the two-time Grand Slam champion, with his two losses (2010 Halle and 2014 Brisbane) coming in the pair's last three meetings overall.

Hewitt is the only player win each of his first three meetings with Federer, and he led the Swiss 7-2 following a Davis Cup win from two sets down in 2003 before Federer turned the tables around.