Top-seed surrenders winning position.
Bernard Tomic made it two wins in a row at the Libema Open.
CoCo Vandeweghe eased into the second round of the Libema Open while Robin Haase beat Ivo Karlovic.
Sloane Stephens and Madison Keys advanced at the Italian Open on Monday.
Karolina Pliskova had good reason to celebrate after beating Coco Vandeweghe in the Stuttgart final.
CoCo Vandeweghe claimed the scalp of another top 10 player to reach the Stuttgart final.
Simona Halep secured a comeback victory at the Stuttgart Grand Prix.
Nick Kyrgios was left impressed after Daria Gavrilova went unpunished for throwing her racquet.