14th July 2019, 19:13 | league_1
After Sam Doherty had broken the deadlock with Doncaster's first try, former Castleford Tigers man Chase opened his account for the South Yorkshire outfit in the 27th minute.
Whitehaven's comeback began with a try from Carl Forster six minutes before the break, which Connor Holliday converted to cut the gap to 12-8.
And Forster got his second almost immediately after the re-start to put Whitehaven ahead for the first time in the game.
A Holliday penalty put Whitehaven 16-12 up before Andrew Bulman's 71st-minute try moved the visitors out of sight.
Oldham kept the pressure on Whitehaven at the summit thanks to a 46-30 victory over North Wales Crusaders.
Richie Hawkyard and Harry Aaronson both crossed twice to tip the scales Oldham's way in a close encounter.
Strugglers Keighley Cougars beat basement boys West Wales Raiders 50-18, with Jack Miller scoring a hat-trick and Benn Hardcastle crossing twice.
Jamie Doran helped himself to a brace as Workington Town won 32-22 against London Skolars, while Hunslet RLFC beat Coventry Bears 48-20 courtesy of a stunning second-half performance in Sunday's other game.
Coventry Bears 20-48 Hunslet RLFC
Doncaster RLFC 12-22 Whitehaven RLFC
Keighley Cougars 50-18 West Wales Raiders
Oldham RLFC 46-30 North Wales Crusaders
Workington Town 32-22 London Skolars