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US Open Photo Gallery Day 4 Starring Alcaraz, Kerber, Medvedev and More!

18-year-old Carlos Alcaraz shocked third-seeded Stefanos Tsitsipas in a US Open five-set thriller to reach the fourth round. EPA-EFE/JUSTIN LANE
Stefanos Tsitsipas reacts during his loss to Spanish sensation Carlos Alcaraz. EPA-EFE/JUSTIN LANE
Carlos Alcaraz made history as the youngest man to beat a Top 3-ranked player at the US Open since 1973. EPA-EFE/JUSTIN LANE
In a battle of former US Open champions, 2016 champion Angelique Kerber conquered 2017 champion Sloane Stephens. EPA-EFE/JOHN G. MABANGLO
Qualifier Peter Gojowczyk reached the US Open fourth round where he will face Carlos Alcaraz. EPA-EFE/JUSTIN LANE
Victoria Azarenka of Belarus throws her racket during her loss to Garbine Muguruza. EPA-EFE/JUSTIN LANE
No. 2-seeded Daniil Medvedev has not dropped a set rolling into a US Open fourth-round clash vs. Dan Evans. EPA-EFE/JOHN G. MABANGLO
Felix Auger-Aliassime of Canada reacts playing Roberto Bautista Agut of Spain in the third round of the US Open. EPA-EFE/JASON SZENES