The former world No. 1 tennis player is still chasing his 18th Grand Slam title and his first since the 2012 Wimbledon .
The former world No. 1 tennis player was seeded for the 15th consecutive US Open .
The former world No. 1 tennis player , who was seeded for the 15th consecutive US Open , is still chasing his 18th Grand Slam title and his first since the 2012 Wimbledon .