By the numbers: Kostyuk rolls past Pegula in Madrid third round

Something had to give at the Mutua Madrid Open on Sunday as two of the first three clay-court title-winners on the WTA Tour Driven by Mercedes-Benz this season -- Marta Kostyuk and Jessica Pegula -- faced off for a spot in the Round of 16. 

Both women entered the match with a 6-0 match record on the surface in WTA events this spring after taking home trophies in Rouen and Charleston, respectively, and winning their second-round matches. After 1 hour and 13 minutes on Arantxa Sanchez Stadium, Kostyuk earned a 6-1, 6-4 victory to be the one who kept her winning streak in tact. 

With her 13th career Top 10 victory, Kostyuk advances to face Pegula's compatriot, Caty McNally, for a spot in the quarterfinals. While Kostyuk will be bidding to reach the quarterfinals in Madrid for the second year in a row, McNally advanced to the fourth round of a WTA 1000 event for the first time in her career after saving two match points in a 6-3, 2-6, 7-6(2) win over Katerina Siniakova. 

More facts and figures from Kostyuk's triumph included: 

2: After losing four of the first five matches she played against Pegula, Kostyuk has now won two in a row in the head-to-head. She also beat Pegula 6-0, 6-3 in the semifinals of the Brisbane International in January.

3: Kostyuk posted runs of three straight games three separate times in victory. She won the first three, and last three, games of the opening set, and also did it from 1-0 down in the second set.

4: The Ukrainian broke Pegula four times on seven break-point opportunities. 

8: Having also picked up a win over Magda Linette in Billie Jean King Cup Qualifiers for Ukraine, eight matches in a career-long winning streak for Kostyuk. After winning her first career title in Austin three years ago, her unbeaten was stopped at five matches. 

10: In all, Kostyuk saved 10 of the 11 break points she faced -- including all nine in the opening set. Four of those came in a five-deuce service hold for 3-0, and then she saved two more in each of the fifth and seventh games.

20: Kostyuk recorded 20 winners in the win -- far dwarfing Pegula's nine. 

27: Kostyuk was particularly effective when returning Pegula's second serves. The American won just 27% of those points in the match.

"I think it was a good match," Kostyuk said in her on-court interview. "I played Jessica this year already, and she's such a tough player, such a solid player, so I was going into this match fully ready for a big battle. I'm very, very happy to finish this in two."

"I think I'm definitely enjoying playing tennis since I got injured in the Australian Open. I had to rethink a little bit how to approach this and how much it costs me to be on this court -- my energy, my physical energy. I'm very happy with the adjustments that we made, I'm very happy with the progress that we're making as a team, and I think that's all that matters.

"I've never had such a long winning streak in my career, so we must be doing something right!"