BEIJING - Poland's Agnieszka Radwanska secured a slot in the WTA Finals with a straight-sets victory in the final of China's Tianjin Open on Sunday.

The 6-1, 6-2 win by the world number six over the much lower ranked Montenegrin Danka Kovinic ensures her place at the WTA Finals in Singapore next month. The second-seeded Pole broke five times without being broken herself to dismiss Kovinic in just 58 minutes.

The $500,000 (440,000-euro) WTA tournament has seen a run of upsets and has been beset by heavy air pollution.