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World No.45 Mischa Zverev kept his home crowd cheering as he stunned top seed Gilles Simon 6-4, 6-2 to reach the quarter-finals of the Mercedes Cup, Stuttgart.
The German saved all five break points he faced in the 66 minute encounter, while capitalising on three of eight break point chances to lead 2-0 overall in the head-to-head matches.
The 21 year-old Zverev is through to his fifth quarter-final of the season and his first at Stuttgart. He also reached the last eight in Zagreb (l. to Hernych), Marseille (l. to Djokovic), ATP World Tour Masters 1000 Rome (l. to Federer) and Halle (l. to Haas).
On the other Simon, who drops to a 25-20 match record for the season, has also failed to reach the quarter-finals on his last three appearances at Stuttgart.