Andy Murray recorded his 20th straight win on the ATP Tour overnight by beating Kevin Anderson to reach the quarter-finals of the Western and Southern Open.
Having previously won the Aegon Championship, Wimbledon and the Olympics, Murray is on the best run of his career - winning 48 sets during the sequence while losing only eight.
He has had the good fortune to avoid his fellow members of the "big four", helped by Novak Djokovic - the last man to beat Murray, at the French Open final - suffering shock early exits at Wimbledon and in Rio while Roger Federer faces a long injury lay-off.
The Scot has won four matches against opponents ranked in the world's top 10 - Milos Raonic twice, Tomas Berdych and Kei Nishikori - and three more against top-20 players in Marin Cilic, Nick Kyrgios and Jo-Wilfried Tsonga.
Four of his wins have come against players ranked outside the top 100 - Juan Monaco twice, fellow Briton Liam Broady and, misleadingly, Olympic final opponent Juan Martin del Potro whose mark of 141 is the result of long-term injury.
Following his near miss at Roland Garros, Murray made a winning return against Nicolas Mahut at Queen's in two straight tie-breaks before seeing off Aljaz Bedene, Kyle Edmund, Cilic and Raonic to take home the trophy.
Though he was pushed all the way by Tsonga in a five-set quarter-final at Wimbledon, they were the only two sets he dropped as Broady, Lu Yen-hsun, John Millman, Kyrgios, Berdych and Raonic each succumbed in three.
Viktor Troicki, Monaco, Fabio Fognini, Steve Johnson, Nishikori and Del Potro could not deny him Olympic gold and he has so far conquered Monaco and Anderson in Cincinnati.
Winning 328 games and losing 200 in the 20 matches means, averaged over the 56 sets he has played, the theoretically average set has gone in Murray's favour by 5.85 games to 3.57 - 6-4 if rounding to a true set score.
An exceptional tie-break record has been important, Murray winning six including a 12/10 epic in the first set against Tsonga at SW19 and losing only one, against Raonic in the first set of the final at Queen's. That is also the only time in the sequence he has fallen a set behind.
Murray's run contains 89 service breaks and 194 break points in all - but, while his returning is so often hailed as a strength, do not overlook his serve. The 29-year-old double-faulted only once in the first four rounds of Wimbledon combined and has sent down 146 aces against only 33 doubles in the 20 matches.
His highest tally was 15 aces against Mahut at Queen's, also one of six occasions without a double fault. Only against Fognini in Rio did Murray serve more doubles than aces, five to two.