Complex sentence: Li extended her winning streak to thirteen consecutive matches by defeating Magdalena Rybáriková in the second round of the Qatar Total Open, before losing to qualifier Petra Cetkovská in the third round.
Split into simpler sentences: Li extended her winning streak to thirteen consecutive matches by defeating Magdalena Rybáriková in the second round of the Qatar Total Open. However, she was upset by qualifier Petra Cetkovská in the third round.