Longest span of Grand Slam singles titles by a tennis player (male, open era)

Roger Federer (Switzerland) claimed his first Grand Slam singles title, against Australia's Mark Philippoussis, at Wimbledon in London, UK, on 6 July 2003. Fourteen years 206 days later, he collected his 20th and most recent title, against Croatia's Marin Čilić, at the Australian Open on 28 January 2018.

Before the start of the open era, Ken Rosewall (Australia) won his home Grand Slam in 1953, with the last of his eight titles also coming in Australia, in 1972 – 19 years later. Since 1968, Boris Becker (1985 Wimbledon to 1996 Australian Open) and Andre Agassi (1992 Wimbledon to 2003 Australian Open) have both won Grand Slam titles over a period of 10-and-a-half years.

Federer (b. 8 August 1981) was 36 years 173 days old when he lifted the winner's trophy at the Australian Open on 28 January 2018. Only once in the open era has an older player won a Grand Slam tournament: Ken Rosewall (b. 2 November 1934) was 37 years 62 days old when he won the Australian Open on 3 January 1972.

Federer won his 20th Grand Slam title – in his 72nd tournament – by defeating sixth seed Marin Cilic 6–2, 6–7, 6–3, 3–6, 6–1 in the final of the Australian Open in Melbourne on 28 January 2018.

As of 28 January 2018, Federer had won Wimbledon eight times (2003–07, 2009, 2012 and 2017), the Australian Open six times (2004, 2006–07, 2010, 2017–18), the US Open five times (2004–08) and the French Open once (2009).