A total of 356 entries jammed the box for a powerhouse opening weekend at Chester Racetrack, as strong fields are slated to contest the $32,000 features on both the Friday and Sunday cards.

Friday’s Open Trot could very well shape up as a battle of the sexes between millionaires Corleone Kosmos and Buck I St Pat, both of which are making their 2010 debuts.

Corleone Kosmos, who has 19 career wins to his name, will be coming in off a pair of solid qualifying efforts at the Meadowlands -- he sprinted home in :27 to complete a 1:54.1 mile in the most recent. The eight-year-old will be driven by Hall of Famer John Campbell for new conditioner Jeffrey Webster.

Corleone Kosmos will square off against top trotting mare Buck I St Pat, who took the 2008 Maxie Lee Memorial in a track and World Record 1:52.2. The mare is coming in to the event off a pair of qualifiers at the Meadowlands where she finished in the runner-up position to Corleone Kosmos on both occasions. Tim Tetrick will drive the seven-year-old distaffer for trainer Ron Burke.

Sunday’s Open Pace boasts a strong field of eight, including Presidential winner Blatantly Good, who proved a mighty presence last fall in the top ranks at tracks all along the eastern seaboard. Richie Silverman handles the driving duties for trainer Mark Kesmodel.

First-race post time for the Friday and Sunday programs is 12:45 p.m. eastern time.

(With files from Chester)