BERLIN (AP) - German qualifier Jule Niemeier upset defending champion Ons Jabeur 7-6 (4), 6-4 within the first spherical of the Berlin Open on Tuesday.

The One hundred and twentieth-ranked Niemeier saved two set factors at 5-3 down within the opening set, then received the final 4 factors of the tiebreaker. Niemeier broke Jabeur within the first sport of the second set and held on to her result in win in 1 hour, 35 minutes for the 23-year-old’s third victory in opposition to a top-10 participant.

Coco Gauff defeated Czech participant Katerina Siniakov 6-3, 6-4 for the American teenager’s twenty third win of the 12 months.

The fourth-seeded Gauff subsequent faces big-hitter Ekaterina Alexandrova, who defeated fellow Russian Liudmila Samsonova 6-4, 6-3.

Top-seeded Aryna Sabalenka eased into the second spherical with a 6-3, 6-2 win over veteran Vera Zvonareva in one other all-Russian match.

Sabalenka transformed three of her 9 break factors with out dealing with any from the 38-year-old Zvonareva, a Wimbledon finalist in 2010.

Sabalenka subsequent faces Veronika Kudermetova or Zheng Qinwen.

Elina Avanesyan saved two match factors and upset sixth-seeded Daria Kasatkina with a 6-2, 3-6, 7-6 (7) win for a gathering with one other Russian compatriot, Anna Blinkova.

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