Jamie Vardy scored his first goal in more than two months to help send a much-changed Leicester City into the fifth round of the FA Cup with victory against fellow Championship side Birmingham.
Blues' on-loan Fulham striker Jay Stansfield hit the post in a first half dominated by the visitors, who were also repeatedly foiled by Foxes goalkeeper Jakub Stolarczyk.
But former England striker Vardy met a Marc Albrighton cross immediately after the break to head the Foxes in front with their first effort on target.
And while the talismanic 37-year-old had a second goal disallowed for offside, well-taken strikes from Yunus Akgun and Dennis Praet ensured the 2021 FA Cup winners and run-away Championship leaders progressed.