Top 5 Photos, July 15: On the Hamburg practice courts with Tsitsipas & PCB

Pablo Carreno Busta looks on during a practice session in Hamburg. PCB would later win his opener in straight sets over Carlos Taberner.

American Jack Sock reacts after clinching a first-set tiebreaker over Kevin Anderson in the pair's Newport quarterfinal.

A closeup look at Hamburg European Open top seed Stefanos Tsitsipas on the practice court.

A driverless Yurikamome line train passes by Ariake Tennis Park, the tennis venue for the upcoming Tokyo Olympics.

Tsitsipas will meet sixth seed Filip Krajinovic in Friday's Hamburg quarterfinals.