SEOUL (AFP) Former world number one Dinara Safina was sent packing from the WTA Hansol Korea Open at the quarter-final stage on Friday, but top seed Nadia Petrova lived to fight another day. Russias Safina is on the comeback trail from a lower back injury and was playing here as a wildcard, but her tournament ended when she succumbed 7-5, 6-3 to Czech Klara Zakopalova. Petrova fared better, advancing to the semi-finals with a 6-2, 6-1 rout of Belgiums Kirsten Flipkens in just 61 minutes. Fifth seed Alisa Kleybanova also remains in the title hunt after winning her match against frequent doubles partner, fellow Russian Ekaterina Makarova, 6-1, 6-2. But Japanese defending champion Kimiko Date Krumm, who turns 40 next week, tumbled out to Hungarian eighth seed Agnes Szavay 6-2, 6-7 (3/7) 6-3, but not before putting up a spirited fight.