(Photo credit: Jay Calderon/The Desert Sun / USA TODAY NETWORK via Imagn Images)

Top-seeded Elena Rybakina escaped in a third-set tiebreaker while No. 2 Coco Gauff and No. 3 Iga Swiatek were upset victims to Karolina Muchova and Mirra Andreeva, respectively, in Friday's quarterfinals of the Porsche Tennis Grand Prix in Stuttgart, Germany.

No. 7 Muchova saved 12 of 15 break points during a 6-3, 5-7, 6-3 victory that marked her first win over Gauff in seven career meetings. The Czech will next face No. 4 Elina Svitolina after the Ukrainian delivered a 7-6 (2), 7-5 win over Czech Linda Noskova.

No. 6 Andreeva of Russia rallied for a 3-6, 6-4, 6-3 win to defeat Swiatek of Poland for the third consecutive time. Andreeva saved 9 of 14 break points while winning in two hours, 36 minutes.

Andreeva next faces Rybakina, who staved off a second match point against Canada's Leylah Fernandez as part of winning the final three points to score a 6-7 (5), 6-4, 7-6 (6) victory. Rybakina had a 7-6 edge in aces and hit 51 winners while winning in three hours, two minutes.

Rouen Metropolitan Open

Teenage qualifier Veronika Podrez of Ukraine reached the semifinals in her first main-draw tournament by rolling to a 6-4, 6-1 victory over Brit Katie Boulter in Rouen, France.

Podrez, 19, had 28 winners against 11 unforced errors while finishing off Boulter in 78 minutes. Podrez's semifinal opponent will be second-seeded Sorana Cirstea after the Romanian registered a 7-6 (2), 6-2 victory over Anna Bondar of Hungary.

Top-seeded Marta Kostyuk of Ukraine and Tatjana Maria of Germany will meet in the other quarterfinals. Kostyuk ousted Ann Li 6-0, 6-7 (4), 6-3, while Maria beat Belarus' Iryna Shymanovich 7-6 (5), 6-2.

--Field Level Media