Rachel Alexandra will step back into Grade 1 company for the first time this season at Saratoga on Sunday in the Personal Ensign Stakes, the feature event on the second day of a weekend full of top-class action in the States.

However, the American horse of the year, who has won her two most recent starts, may not have things all her own way as her rivals in the $300,000 contest will be headed by Life At Ten, a Grade 1 winner chasing her seventh successive victory.

Rachel Alexandra completed her preparations for the 1m2f contest on Monday when she breezed four furlongs on Saratoga's Oklahoma training track under Shaun Bridgmohan.

She completed the drill in 48.89s, the second fastest time of 14 workouts at the distance.

"With her, you're very careful with the rhythm she gets into to start off," said trainer Steve Asmussen.

"She's very strong and very physical and likes to do quite a bit. I think Shaun has done a great job with her, getting her away from the pole smoothly. And once she's into a rhythm I think it's been pretty good from there."

Trainer Todd Pletcher is targeting Rachel Alexandra with Life At Ten. "She's in very good form right now, and she's obviously on a winning streak," he said.

"I think her races this year have been better than some have given her credit for, but I also think it's a very, very tall order to take on Rachel Alexandra."

Pletcher will be represented by Kentucky Derby winner Super Saver in a strong field for the $1m Travers Stakes on Saturday, where the ‘midsummer derby' is one of three Grade 1s on the best card of the meeting.

"I believe the Haskell has moved him forward," said the trainer. "And I would expect an improved performance from him in what appears to be a wide-open race."

Rivals will include the horses who finished second in all three legs of the Triple Crown: Ice Box (Kentucky Derby), First Dude (Preakness) and Fly Down (Belmont).

On the other side of the country, Del Mar also hosts its signature race on Saturday with the Pacific Classic, in which 2008 Racing Post Trophy winner Crowded House will have his second outing in California in a $1m event headed by last year's winner Richard's Kid and Hollywood Gold Cup hero Awesome Gem.

On the same card, the Grade 1 Pat O'Brien features the return of Dubai Golden Shaheen winner Kinsale King after his visit to Britain this summer, where he was such a good third to Starspangledbanner in the Golden Jubilee.

Scenic Blast, who won the King's Stand at Royal Ascot last year for Australia, is set to step up in trip for the Grade 2 Del Mar Mile.