Jankovic returns to the semis after also making the last four in 2006
Second seed Jelena Jankovic reached the semi-finals of the US Open with a straightforward 6-1 6-4 win over Austrian Sybille Bammer.
In a match moved from Arthur Ashe to Louis Armstrong Stadium because of the late-running Roger Federer match, Jankovic was always in control.
She goes on to face Olympic champion and fifth seed Elena Dementieva.
The Russian made short work of her quarter-final clash with Switzerland's Patty Schnyder, winning 6-2 6-3.
Both Dementieva and Jankovic have yet to win a Grand Slam title but could become the new world number one if they reach the final at Flushing Meadows.
Dementieva has won 11 matches in a row following her success in Beijing and she looked in good shape against 15th seed Schnyder.
The Russian controlled things from the baseline as she broke twice to take the first set and held off Schnyder in the second to complete an impressive win.
Her consistency was the key to taking the first set, and some thumping returns also put pressure on the Schnyder serve throughout.
Only once, when the Swiss broke back to make it 3-3 in the second set, did Dementieva seem under pressure but she broke back again immediately and did not lose another game.
I am very excited to be in the semis but I'm sure I need to improve my game and play a better match if I want to get to the final
"We had a big fight in the second set and I lost my serve so it was a very, very important moment for me to break her again," Dementieva said.
"I'm very happy that I was able to do that. I expected a tough match against her and I am pleased with the way I played.
"I am very excited to be in the semis but I'm sure I need to improve my game and play a better match if I want to get to the final."
Jankovic raced through the first set against Bammer in 33 minutes, then traded six breaks with the left-hander in the second.
But despite failing to serve out the match, Jankovic broke in the following game to move within one win of a first Grand Slam final.
"It will be a really tough one but I have beaten her before," Jankovic said of her semi-final against Dementieva, against whom she has a 4-3 record.
"I will really try my best and hopefully I can make my first Grand Slam final."