BIRMINGHAM, England (AP) -- Olympic champion Lin Dan and world champion Chen Long set up an eagerly-anticipated semifinal at the All England Open after contrasting wins on Friday.
Lin edged past Kento Momota of Japan 21-18, 21-19 in a tight quarterfinal, while Chen produced a masterful performance to defeat Chou Tien Chen of Taiwan 21-11, 21-11.
"I adjusted my mentality really well and it was a calm and controlled performance," Lin said.
Lin and Chen's meeting will be their first on the Superseries circuit since Lin won a world championship encounter in 2013.
Earlier, Ratchanok Intanon of Thailand, who became the youngest ever world champion in 2013, had to retire from her quarterfinal at the All England Open because of cramps late in the deciding game.
Ratchanok led 11-5 in the decider against Sun Yu of China, but her opponent rallied for a 19-13 lead before the Thai player fell awkwardly going for a backhand return.
After several minutes on the ground, Ratchanok shook hands with Sun, who advanced to the semifinals for the first time with an 11-21, 21-19, 19-13 victory.
Sun said "we are good friends off court and I feel for her."