CHICAGO, IL, USA - Russia's Anna Blinkova scored the upset of the day in the Oracle Challenger Chicago when she beat top seed Danielle Collins 7-6, 6-2 to set up a quarterfinal clash with Sachia Vickery.
Vickery beat another American, wildcard Allie Kiick, 6-4, 6-0 to grab her own spot in the next round; while another home favorite Madison Brengle fell to Tatjana Maria, 6-3, 6-2.
The German now faces Canada's Francoise Abanda, who beat Johanna Larsson of Sweden 3-6, 6-3, 6-3.
Second seed Petra Martic is still in the draw; the Croatian got past Sesit Karatantcheva of Bulgaria 6-4, 6-2.
In a hard-fought duel, Mona Barthel beat Zarina Diyas in three sets, 6-2, 3-6, 6-3, to secure a quarterfinal clash with Dayana Yastremska, who beat US qualifier Kristie Ahn 7-6(3), 6-4.
The longest match of the day - at an grueling three hours and 14 minutes - was wildcard Varvara Lepchenko's win over Sara Sorribes Tormo, 6-4, 6-7, 6-4.
Dayana Yastremska does it again!
Our first winner of the day hails from the Ukraine 🇺🇦.
7️⃣ 6️⃣, 6️⃣ 4️⃣ over Kristie Ahn.#RoadtoIndianWells pic.twitter.com/yoeM6Wfl5O— Oracle Challenger Series (@OracleChallngrs) September 6, 2018
FRIDAY'S ORDER OF PLAY
COURT 1
Starting at 10am
[Q] Francoise ABANDA (CAN) v Tatjana MARIA (GER) [4]
After 1 ATP match
[WC] Varvara LEPCHENKO (USA) v Petra MARTIC (CRO) [2]
COURT 2
Starting at 10am
After 1 ATP match
Anna BLINKOVA (RUS) v Sachia VICKERY (USA) [6]
After 1 ATP match
Mona BARTHEL (GER) / Kristyna PLISKOVA (CZE) v Darija JURAK (CRO) / Xenia KNOLL (SUI) [2]
COURT 3
Starting at 11am
Mona BARTHEL (GER) v Dayana YASTREMSKA (UKR)
After 1 ATP match
Asia MUHAMMAD (USA) / Maria SANCHEZ (USA) v Evgeniya RODINA (RUS) / Dayana YASTREMSKA (UKR)