Daniel Altmaier vs Ben Shelton — R16 — Hamburg Open

Daniel Altmaier, ranked No. 64, knocked out world No. 6 Ben Shelton 4-6, 7-6(4), 6-4 in their first meeting, flipping the gap behind the second serve and a flood of free Shelton mistakes. The American piled up 43 unforced errors to Altmaier's 24, and despite saving eight of 11 break points, dropped serve at 5-4 in the third. Altmaier won 71% of his first-serve points and converted three of 11 break chances to close out the upset in nearly four hours.