Unheralded American qualifier Ryan Harrison has scored the upset of the US Open, defeating Canadian fifth seed Milos Raonic in the second round.
The 24-year-old Harrison, who was considered a huge talent as a teenager is now through to the third round of a grand slam for the first time after the 6-7 (7-4) 7-5 7-5 6-1 victory.
The world No.120 ranked American blunted the Raonic serve throughout the match, winning seven of 18 break points as the Canadian struggled with his game.
Raonic made a huge 62 unforced errors and served and uncharacteristic 15 double faults in the encounter.
Harrison will now play Cypriot veteran Marcos Baghdatis in the third round after Baghdatis himself caused a boilover, beating French 32nd seed Benoit Paire 6-2 6-4 3-6 6-4. Earlier world No.1 Novak Djokovic has received a free pass into the third round after Jiri Vesely of the Czech Republic withdrew from their match due to a left forearm injury.
The walkover provided the top-seeded defending champion with an extended break to improve his niggling left wrist injury before his next match against either Guido Pella of Argentina or Mikhail Youzhny of Russia.
The 23-year-old Vesely, ranked 49th, beat Djokovic in the second round at the ATP Masters 1000 Monte Carlo event in April in their only meeting, making him one of two top 100 players with more wins than losses against the Serbian.