Top seed Ana Ivanovic tumbled out off the Pattaya Open on Thursday, losing in the first round to Japan's Ayumi Morita, while defending champion Daniela Hantuchova eased into round two. Ivanovic, who has struggled to regain the form that saw her crowned world number one in 2008, lost in three sets (6-3, 5-7, 6-3) to Morita -- ranked 47 places below her.