Albion regained top spot in the Championship after an eye-catching 4-1 victory over fellow promotion rivals Bristol City.
The Baggies found themselves down in second place in the league after Leeds’ win at Reading 24-hours earlier.
But it didn’t take Slaven Bilic’s men long to regain top spot after two wonderful first half goals from Kieron Gibbs and a sublime Matheus Pereira free kick took Albion into a two goal advantage at half time.
The visitors, who had only lost two games all season prior to their visit at The Hawthorns, rallied after the break and were given a lifeline when Famara Diedhiou fired home from close range after a scramble from a corner.
But the goal kick-started Albion and two late strikes from Hal Robson-Kanu and substitute Charlie Austin settled any concerns about an unlikely comeback from the visitors.
Matt Phillips created the third with a drilled ball across the six yard box that Robson-Kanu slide in and Darnell Furlong’s whipped cross found Charlie Austin all alone to top home the rebound after his first effort hit the post.
The win not only moves Albion two points clear of Leeds, but also seven points clear of third-placed Fulham in the Championship.