Roger Federer is a Swiss former professional tennis player. He was ranked world No. 1 by the Association of Tennis Professionals for 310 weeks, including a record 237 consecutive weeks, and finished as the year-end No. 1 five times. He won 103 ATP singles titles, the second most of all time, including 20 Grand Slam singles titles, a record eight men's singles Wimbledon titles, an Open Era record-tying five men's singles US Open titles, and a record-tying six year-end championships. Federer played during an era where he dominated men's tennis along with Rafael Nadal and Novak Djokovic as the Big Three, collectively considered by some to be the three most successful male tennis players of all time. Federer's 20 Grand Slam singles titles also put him at third most of all time, only behind Djokovic with 21 and record holder Nadal with 22, as of the end of 2022 season when Federer retired.