MUMBAI, India - Trailing 6-4, 3-0, Montenegro's Danka Kovinic sprung a surprise on Tuesday at the L&T Mumbai Open, upsetting No.4 seed and Moscow River Cup champion Olga Danilovic, 4-6, 7-5, 6-0 in the opening round. 

Kovinic also trailed 4-2 in the second set before ripping off five of the last six games to send the match to a decider, ultimately winning the last nine in the match.

The Montenegrin's upset of the No.4 seed was the lone first-round upset on Tuesday at the WTA 125K in Mumbai, as top seed Zheng Saisai, No.5 seed Luksika Kumkhum and No.6 seed Margarita Gasparyan all advanced with victories.

No.2 s eed Dalila Jakupovic also booked her spot in the quarterfinals with a 6-4, 6-2 win over Sabina Sharipova. She will be joined in the last eight by Irina Khromacheva and Valentini Grammatikopoulou, who scored three-set wins over Urszula Radwanska and Deniz Khazaniuk, respectively. 

Kumkhum also came from a set down to reach the second round, outlasting Indian teenager Pranjala Yadlapalli, who served for the match in the second set, 3-6, 7-5, 6-1. 

It wasn't a totally lost day for home favorites, however, as Indian No.1 Ankita Raina rallied for a 4-6, 6-2, 7-6(5) win in two hours and 17 minutes over compatriot and former Texas A&M University product Rutuja Bhosale.