John Isner of the US reacts after defeating Ryan Harrison at the BB&T Atlanta Open in July. Photo: Erik S. Lesser/EPA

PARIS – As the US Open gets underway at Flushing Meadows the ATP rankings reveal just two American men in their world top twenty, 11th placed John Isner and in 18th Jack Sock.

The pair are both in action on the opening day with Sock facing Argentine Guido Andreozzi and Isner tackling compatriot Bradley Klahn.

Atop the rankings are the veteran rivals defending US Open champion Rafael Nadal and the Swiss master Roger Federer in 2nd.

The 2017 US Open champion Stan Wawrinka is out of the top 20 as is 2012 champion Andy Murray, who is coming back from hip surgery.

Jack Sock is one of only two Americans in the top ATP ranks ahead of #USOpen. Photo: Philip Wright/EPA
Jack Sock is one of only two Americans in the top ATP ranks ahead of #USOpen. Photo: Philip Wright/EPA

The Top 20 are:

1. Rafael Nadal (ESP) 10040 pts
2. Roger Federer (SUI) 7080
3. Juan Martín Del Potro (ARG) 5500
4. Alexander Zverev (GER) 4845
5. Kevin Anderson (RSA) 4615
6. Novak Djokovic (SRB) 4445
7. Marin Cilic (CRO) 4445
8. Grigor Dimitrov (BUL) 3790
9. Dominic Thiem (AUT) 3485
10. David Goffin (BEL) 3435
11. John Isner (USA) 3200
12. Pablo Carreno (ESP) 2425
13. Diego Schwartzman (ARG) 2380
14. Fabio Fognini (ITA) 2190
15. Stefanos Tsitsipas (GRE) 2042
16. Kyle Edmund (GBR) 1935
17. Lucas Pouille (FRA) 1915
18. Jack Sock (USA) 1815
19. Kei Nishikori (JPN) 1755 (+2)
20. Borna Coric (CRO) 1735

Agence France-Presse (AFP)