http://news.yahoo.com/s/ap/20091029/ap_on_sp_te_ne/ten_wta_championships]Serena Williams reaches semifinals in Doha (AP)[/URL]



AP - Serena Williams became the first player to clinch a spot in the semifinals of the WTA Sony Ericsson Championships after defeating Elena Dementieva 6-2, 6-4 Thursday for her third straight win in the round-robin tournament.