Jankovic has won four titles this season and nine in her career
World number one Jelena Jankovic won her third WTA title in as many weeks by beating Russian Vera Zvonareva 6-2 6-4 to triumph in the Kremlin Cup.
The Serb defeated the home favourite in one hour and 21 minutes to add to her victories in the China Open and the Porsche Grand Prix in Germany.
"I feel really emotional winning my third event in a row here," the 23-year-old said.
"I feel great as the world's number one and really enjoy it.
"It was very tough to win as Vera never gives up. She forced me to play my best tennis to win today."
Playing her sixth final of the season, Jankovic started the match with an immediate break for a comfortable 2-0 lead and then broke again to take the opening set in 33 minutes.
In the second Jankovic produced two more breaks but Zvonareva, ranked ninth in the world, broke back to level on both occasions.
But in the ninth game Jankovic managed to make the deciding break, going on to wrap up the match and take her ninth career title.
The Serb's victory means she will retain her world number one status, having overtaken Serena Williams last week.
The American was forced to pull out of the Russian tournament with an ankle injury.
On the second-tier ITF circuit, British number one Anne Keothavong won the singles title at the inaugural Barnstaple Open.
The world number 80 beat Italy's Alberta Brianti 6-4 6-2 in Sunday's final.