Saturday’s $1 million Grade 1 Cotillion at Parx Racing brings together three of the nation’s leading 3-year-old fillies in a showdown that could help shape the division championship picture.

Scottish Lassie (9-5), La Cara (7-2), and Good Cheer (5-2) have each captured Grade 1 events this season, and now the trio will square off at a mile and a sixteenth.

The Cotillion is race 13 on a 15-race program, with the Grade 1 Pennsylvania Derby sharing headlining status.

Scottish Lassie, trained by Jorge Abreu, comes in off her biggest career triumph in the Coaching Club American Oaks (G1) at Saratoga, where she dictated the pace and powered away to win by 15 ½ lengths. The daughter of McKinzie has never run at Parx, but she has already proven her class with two Grade 1 wins, including last year’s Frizette.

La Cara, trained by Mark Casse for Tracy Farmer, adds another pace element to the mix. A forward-running daughter of Street Sense, she took the Acorn (G1) in June at Saratoga, finishing more than three lengths ahead of Scottish Lassie. She’s been ambitious all season, winning the Ashland (G1) at Keeneland and setting the pace before tiring in the Alabama (G1) last month.

Good Cheer, representing Godolphin and trainer Brad Cox, brings the deepest résumé. Winner of the Kentucky Oaks (G1) in May, she also owns the Fair Grounds Oaks (G2) and Rachel Alexandra (G2). The Medaglia d’Oro filly won the first seven starts of her career before a disappointing fifth-place finish – at 3-10 odds – behind La Cara and Scottish Lassie in the Acorn. Last out she finished second behind Nitrogen in the Grade 1 Alabama.

The trio won’t have the Cotillion all to themselves. Indy Bay (8-1) arrives in top form for trainer Saffie Joseph Jr., having captured the Charles Town Oaks (G2) with a determined score  in her last start. A daughter of Take Charge Indy, she has won four of her last five, all between six and seven furlongs, and will look to upset the apple cart with Tyler Gaffalione in the irons.

Others in the field add depth and intrigue. Clicquot, unbeaten in three starts since breaking her maiden earlier this year, enters off a sharp score in the Indiana Oaks (G3) and will be testing Grade 1 company for the first time. Dry Powder proved her Parx affinity with a decisive win in the Cathryn Sophia Stakes (L) last month, while Ourdaydreaminggirl chased her home in second that day and continues to improve locally for Louis Linder Jr. Not Too Late, a hard-trying filly from the Uriah St. Lewis barn, earned a local stakes win at Monmouth earlier this summer and gets a class test here.

With three established Grade 1 heroines, a Grade 2 winner on the rise, and several improving fillies stepping up in class, the Cotillion promises a high-stakes battle where both tactics and stamina will be tested.