Sitting the pocket behind the pacesetting Friendnheartbeat (Art Stafford Jr.), Boca Hanover sprinted up the passing lane to best Magic Card (Tony Morgan) and Friendsnheartbeat held for third in 1:51.1.
It also tied the fastest distaff mile in Rosecroft's 65-year history with Queen Of Trash.
Frank Milby drives and trains the daughter of The Panderosa for owner Denise Beaver.
Milby scored another victory in the Filly and Mare Open, sending Rocket Rosy right to the front and she never looked back, scoring in 1:51.4 for owner Brian Callahan and trainer Brian Fisher. It was her second straight win at the top level. Megs Breeze was second and Together Again N was third.
Winbak Carl won his third colts and geldings Open of the meet, scoring in 1:51 for Morgan. I Wanna Go Fast (Donnie Russell) was second and pacesetter Shady Breeze (Jonathan Roberts) was third.
Roberts copped the Open II with Caviart Tyler for owner Tom Cooke and trainer Bib Roberts in 1:51.2.
Roberts, Morgan and Milby dominated the Tuesday night card, winning nine of the 12 races as each picked up three wins.