The 29-year-old today collected his first title since 2016 Memphis, beating Russian Daniil Medvedev 6-4, 3-6, 6-2 to win Brisbane.
South Korean Chung, who reached the Australian Open semi-finals a year ago, fell at the first hurdle for the second tournament in succession, going down 7-5 6-3 to a player ranked 285 places below him.
Second-seeded Nishikori peeled off four straight games to erase a 3-0 deficit to win the first set and ensured missed opportunities in the second set didn't haunt him as he sprinted clear in the decider.
The third set was all Pliskova as she broke Tsurenko twice to wrap up the final in two hours, 12 minutes.
"I played a great match; I expected something like this before the match because I saw him play a few times", Tsonga said. I felt like I was too fast on the court today.
Jo-Wilfried Tsonga's comeback from injury gathered pace when he overcame seventh seeded Australian Alex de Minaur in a high quality Brisbane International quarter-final on Friday.
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"And despite many chances that he had, I managed to hold my serves".
"I always start with this tournament and Melbourne, [but I] couldn't make it past year".
The 2019 Brisbane International titles have been claimed by Japan's Kei Nishikori and Czech Republic's Karolina Pliskova, with both players showing determination under pressure in their respective finals on Sunday.
"So I had to start at some ATP Challenger Tour events", said Nishikori. The Frenchman hit a backhand victor down the line to take his second break and a 5-4 first half lead, before serving out to love to clinch the opener. "Playing good tennis [and being] very happy and healthy is one of the best keys for me".
"I feel like last year I did a lot of that, and I'm trying to change it more, and I think I have - like toward the end of last year".
Going into the match, the pair were very evenly matched, at least on paper, having played each other twice before, both past year, with the results split evenly between the two of them.