Roger Federer remains composed as he edges closer to his 20th Grand Slam title.

It was business as usual on Arthur Ashe stadium on Monday night, as world number 3 Roger Federer made short work of German journeyman Philipp Kohlschreiber. The Swiss superstar dominated his opponent, taking their fourth round match 6-4 6-2 7-5 in 1 hour 49 minutes to advance to the US Open quarter-finals.

Federer improved his record to 12-0 against Kohlschreiber. Amidst concerns of a nagging back injury, the Swiss legend dispatched of his old friend with ruthless aggression. Any signs of a back issue were not evident, as he moved with the grace and confidence to which fans are accustomed.

Kohlschreiber had been impressive throughout the tournament, but defeating his longtime rival would be a daunting task.

Kohlschreiber had not dropped a set the entire tournament, defeating Kyrgios’s conqueror John Millman 7-5 6-2 6-4 in the third round. Conversely, Federer had just acquired his first straight sets victory of the tournament, defeating Feliciano Lopez 6-3 6-3 7-5 in his third round match.

Kohlschreiber came out strong in the opening set, employing his consistency to remain level with Federer. He however lacks the firepower necessary to trouble the 19-time Grand Slam champion, and was broken in the seventh game after securing a 40-0 lead. With only one break needed, Federer then went on to claim the first set 6-4 in 38 minutes.

Prior to the match, Kohlschreiber had stated in an interview that he had developed a different strategy with which to play Federer. This new game plan was found lacking however, as the world number 3 broke Kohlschreiber in the fifth game of the second set to lead 3-2. He then dominated his opponent with exquisite groundstrokes and precision at the net; reeling off another three straight games to take the set 6-2 in 27 minutes.

Federer did request a medical timeout prior to the third set, but he resumed play with little hindrance to his movement. Kohlschreiber did his best to remain in the match, but was unable to break the Federer serve. The German was then broken in the eleventh game via a sublime Federer backhand passing shot, before Federer served out the match and secured his spot in the quarter-final.

The Swiss superstar now faces Juan Martin del Potro, who overcame Austrian Dominic Thiem in an epic five-setter. He holds a 16-5 lead over the Argentine, but the two have not met at the US Open since their classic final in 2009. Del Potro prevailed in that encounter and claimed his sole Grand Slam title. Although the odds favor Federer to make it to the semifinal, Del Potro has proven that he has the heart and skill necessary to cause the upset.

Do you believe Del Potro can replicate his 2009 victory? Or is a Federer-Nadal semifinal inevitable at this point? Share your thoughts in the comments section, check out our point-by-point recap here and be sure to follow us on for continued coverage of the 2017 US Open.