And he hopes that he can continue the momentum into the Australian Open, where he has never been beyond the quarter-finals.
The unseeded Tsurenko looked headed for the biggest win of her career when serving for the match at 5-4 in the second set, only for Pliskova to come storming back to win 4-6,7-5, 6-2 and claim her second Brisbane title.
Czech Republic's Karolina Pliskova celebrates winning her match against Australia's Ajla Tomljanovic.
Medvedev, who saw off Jo-Wilfried Tsonga in the semi-finals, saved eight break points in the second set before capitalising on an unusually errant service game from Nishikori and levelling the match.
At 4-4 in the decider, Medvedev then rallied from 0-40 down to gain the decisive break when his former world No. 3 opponent hit a cross-court forehand well wide.
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"It was a odd match today, but the beginning of the sets was important. Playing good tennis [and being] very happy and healthy is one of the best keys for me".
"I just tried to change the things around a little bit and believed I was going to get a chance".
Nishikori and Medvedev split their two FedEx ATP Head2Head meetings, with the Russian winning their most recent contest a year ago in the Tokyo final.
Peter Gojowczyk beat Guido Pella 6-1 3-6 6-2 to set up a meeting with second seed Fabio Fognini in round two and Pablo Cuevas went down to 7-5 6-1 to Ugo Humbert.
"When you're able to turn these matches around, it gives you some extra and different confidence", Pliskova said.
"And he did really well the last game, I mean the 4-3 game".
· In Shenzhen, top seed Aryna Sabalenka won her third career title, also coming back from a set down to beat Alison Riske 4-6, 7-6 (2), 6-3.