Meanwhile, Osaka advanced to the third round and had Madison Keys on the ropes before the American rallied for the win.
Former world number one Karolina Pliskova utilized her big serve to full effect to ease to a 6-4 6-4 victory over home favorite and U.S. Open champion Naomi Osaka in the Pan Pacific Open final in Tokyo on Sunday.
She allowed her opponent to break her service in the 9th game, and lost the set, 4-6.
Wuhan Open organisers confirmed Osaka's withdrawal due to a viral illness on their Twitter page. Her 6-3 6-0 demolition of Simona Halep, one of the Tour's best defenders, in the Indian Wells semifinals a particularly memorable display of her attacking power.
Third-seed Osaka, 20, said after the match that she "felt really exhausted today" and that she "wasn't doing the little things well", after having not dropped a set in tournament until Sunday.
Osaka, who has not dropped a set this week, will now face world number eight Karolina Pliskova in Sunday's final after she beat Donna Vekic. "She was missing quite a lot today and it was working, so I didn't change anything".
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This, the official added, would not change given that Russia's production would decline over the cold months of the year. Cofounder Daniel Jaeggi said in a speech at the S&P Global Platts Asia Pacific Petroleum Conference, knows as Appec.
"I just wanted to be patient and wait for my chances". Pliskova said. "I feel like I'm improving in every match, but the opponents are always more tough".
The same can not be said of Pliskova, who is excellent at the line. She is then scheduled to play in the Hong Kong tournament at Victoria Park, starting on October 6.
After saving two match points against American qualifier Alison Riske in the last round, and coming back from a set down against Daria Gavrilova earlier in the tournament, Pliskova had to go the distance once again, needing 2 hours and 5 minutes.
Vekic, though, had defeated top 10 players Sloane Stephens and Caroline Garcia on route to the last four and recovered from an early break of serve in the second set to secure two breaks of her own. She finished with 26 unforced errors and admitted to being exhausted after the match. Klizan went on to take the set.
Tomljanovic in the semi-finals of the singles on Saturday ousted Taiwan's Hsieh Su-wei, who nonetheless made a final, pairing up with sister Hsieh Shu-ying against South Korean duo Choi Ji-hee and Han Na-lae in the doubles.