Leicester took all three points away from the Hawthorns as Jamie Vardy added to his impressive tally this season.
The Englishman scored what turned out to be the decisive goal as the Foxes came from behind to beat West Brom, with Riyad Mahrez netting a brace.
West Brom boss Tony Pulis would have every right to feel aggrieved, though, as his side were also denied two strong penalty claims during the game by referee Anthony Taylor.
Leicester started by far the better of the two sides, and it was the in-form Vardy who nearly broke the deadlock in the opening minutes.
Before today, all eight of West Brom's Premier League goals this season had come in either the 15 minutes before half-time or the 15 minutes after the break (four in each period), and Rondon's opener was just seconds out from continuing that record, as he powered home a header at the near post from Stephane Sessegnon's corner just before the clock hit 30 minutes.
West Brom had the momentum and felt they should have had a penalty when Evans had his shirt pulled in the box by Leicester striker Leonardo Ulloa - but referee Taylor wasn't interested.
Riyad Mahrez levelled for the in-from Foxes just 10 minutes after the break.
It came out of nowhere after Marc Albrighton's testing cross from the left was met perfectly by the Algerian at the far post, who side footed it in for his sixth goal in the Premier League this season.
Vardy then went inches wide of what would have been a sublime goal before Mahrez was at the double just eight-minutes later.
Albrighton provided the assist again with a cross from the right which took a deflection and fell nicely to Mahrez slid in to bury the ball home from close range.
And the game was all but good and done when Vardy did get that goal to make it eight games in a row, joining Ruud van Nistelrooy and Daniel Sturridge as the only Premier League players to do so.
There's no keeping the Englishman down at the minute, who homed in on goal to bury the ball low beyond the onlooking Myhill.
There was still time for the hosts to get a second, after Nathan Dyer brought down Calum McManaman in the box.
