Top seed Zverev beaten by Brown in Stuttgart
Dustin Brown won a three-set tussle.
Dustin Brown pulled off another grass-court upset at the Mercedes Cup in Stuttgart.
Second seed Karen Khachanov, like Zverev a quarter-finalist at the French Open, also fell, losing 6-4 6-2 to Italy’s Matteo Berrettini.
The top seed also fell at the Libema Open in ‘s-Hertogenbosch, with Chilean Nicolas Jarry knocking out Stefanos Tsitsipas 6-4 3-6 6-4.