Former champion Philipp Kohlschreiber produced another fine display in Munich as he upset second seed Karen Khachanov in the second round of the BMW Open.
The German veteran, who won the tournament in 2007, 2012 and 2016, booked his place in the quarter-final with a 7-6 (8-6), 6-4 win in one hour and 50 minutes.
— BMW Open by FWU (@BMWOpenbyFWU) May 2, 2019
Next up for Kohlschreiber is Matteo Berrettini after the Italian overcame Denis Kudla from the United States 7-5, 6-3.
The other quarter-final in the bottom half of the draw will feature Roberto Bautista Agut and Guido Pella.
Fourth seed Bautista Agut saw off the challenge of German wildcard Rudolf Molleker, winning 6-4, 6-2 in one hour and 17 minutes, while seventh seed Pella required two hours and 19 minutes to beat Taro Daniel 6-1, 6-7 (7-9), 6-3.
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