Sam Querrey is on track to serve his way into the Nitto ATP Finals in London this November.

That will make you do a double-take since he is currently No. 21 in the Emirates ATP Rankings. But dig a little deeper and you will find he is No. 10 in the Emirates ATP Race to London, with two players ahead of him (Novak Djokovic and Stan Wawrinka) already declaring their 2017 season over.

Querrey’s career-high ranking is No. 17 (31 January 2011), and he looks set to blow right past that in the coming months, as he only has 20 Emirates ATP Rankings points to defend for the rest of 2017. If he continues recent form, he could quite conceivably find himself in the Top 10 before the end of the year.

Querrey’s serve is the prime mover of his game, but not all his serve metrics this season are at their peak.

Take for example his first serve percentage. He is only making 57.2 per cent (2,001/3,495) of first serves leading into the 2017 US Open, which is the lowest it’s been for him since 2007, where he finished the season ranked No. 63. Querrey is ranked a lowly 73rd on the ATP Stats LEADERBOARD with first serves made in the past 52 weeks.

But look out world when he does get it in.

The Californian jumps all the way up to fourth best on tour winning points behind his first serve, at 80.3 per cent (1,607/2,001). His run to the Wimbledon semi-finals was slightly higher again, where he won 82 per cent (397/486) of his first serve points.

Querrey is an ace machine. He is fifth best on the ATP World Tour in the past 52 weeks hitting aces, averaging 12.9 per match. Since the beginning of 2015, Querrey is averaging slightly better than an ace a game, hitting 1,839 aces in 1,822 service games.

Another way to think about it is that he is essentially starting his service games at 15/0 since he can rely so heavily on bombing an ace. When Querrey does forge ahead 15/0 in his service games this season, he holds serve 93 per cent (356/382) of the time. He has also only dropped 10 service games out of 275 when he has led 30/0, and is a perfect 206/206 holding serve when leading 40/0 this year.

The following three serve criteria also shed light on how strong his service games have been in 2017.

2017 Holding Serve
• Serving with new balls = 82% (47/57)
• Holding serve after breaking serve = 87% (100/115)
• Holding serve when serving for the set = 93% (25/27)

Querrey is in action later today in the US Open third round against Radu Albot from Moldova. Expect him to light up New York City with another stellar serving display.