Jelena Jankovic has added one last tournament to her calendar before taking a break during the off-season.
The former world number one has booked the final singles berth into the season-ending Sony Ericsson Championships in Doha, Qatar.
The world’s top eight singles players and top four doubles teams from the 2009 Sony Ericsson WTA Tour season will compete for the coveted Sony Ericsson Championships title and a share of the record $4.55 million prize money.
