Nick Kyrgios has made a winning start to his grass-court season, teaming up with fellow Australian Matt Reid to win their opening doubles match at the ATP event in Stuttgart.
Kyrgios - who missed the French Open with illness - combined with Reid on Monday to upset second-seeded Croatian duo Nikola Mektic and Franko Skugor 6-4 3-6 10-4.
World No.36 Kyrgios will open his singles campaign on Tuesday with a first-ever meeting with Italy's Matteo Berrettini.
The winner will advance to a second-round showdown with Russian Karen Khachanov, the tournament's second seed.
Kyrgios's countryman John Millman will take on German qualifier Dustin Brown with the victory progressing to face top seed and French Open quarter-finalist Alexander Zverev.
Australian qualifier Alexei Popyrin will face sixth-seeded Milos Raonic in the first round with Jo-Wilfried Tsonga awaiting the winner.
Frenchman Tsonga booked his spot in round two by powering past 2017 semi-finalist Mischa Zverev 6-3 6-0 in less than an hour.
Earlier on Monday, 19-year-old Serb Miomir Kecmanovic rallied to beat German veteran Philipp Kohlschreiber 4-6 7-5 6-3.