Clarkes injury scare Michael Clarke's bad back has piled fresh uncertainty on Australia's buildup to the Ashes series. Australian physiotherapist Alex Kountouris has confirmed that Clarke is not a certainty for the first of the five-Test series which starts on Thursday. Usman Khawaja has been called up as a standby. Bhupathi wins,Paes loses Mahesh Bhupathi and Max Mirnyi beat Lukasz Kubot and Oliver Marach 7-6 (2) 6-4 at the ATP World Tour Finals on Monday. Leander Paes and Lukas Dlouhy lost to Mariusz Fyrstenberg and Marcin Matkowski of Poland 6-3 7-6 (3). Roger Federer,Andy Murray and Novak Djokovic won in their respective matches. Armstrong for triathlon Lance Armstrong will compete in a sprint-distance triathlon in New Zealand in January. Organisers of the Blue Lake Multisport festival at Rotorua on New Zealand's North Island have confirmed Armstrong's presence in the January 29-30 event. Pakistan fight back Skipper Misbah-ul-Haq and Azhar Ali led Pakistans fightback with half-centuries to keep South African hopes of enforcing the follow-on at bay on the third day of the second Test. Brief scores: SA 1st innings 584/9 dec; Pakistan 1st innings 317/6 (A Ali 90,Misbah-ul-Haq batting 77; D Steyn 3/78,P Harris 2/71) Mannys retirement plans Manny Pacquiao has said he plans to retire in three years. Pacquiao also said he is willing to fight Mexican Juan Manuel Marquez again but it would probably not excite fans. "I think people are not so interested.because if I were a boxing fan,I would not watch Pacquiao vs Marquez," he said.