(CNN) -- Birmingham City avenged their FA Cup quarterfinal defeat at Portsmouth on Saturday, beating the English Premier League bottom side 2-1 to nudge them closer to relegation on Tuesday.
Cameron Jerome put the visitors ahead in the 16th minute when he ran onto Christian Benitez's pass before sliding the ball past goalkeeper David James.
And the two Birmingham strikers combined again just before half-time, when Benitez back-heeled the ball for Jerome to shoot under James.
Portsmouth had their chances after the break and pulled a goal back in the final minute when substitute Kanu headed home a Jamie O'Hara cross.
The result leaves Portsmouth five points from safety, with a nine-point penalty still looming after falling into administration.
Meanwhile, Portsmouth have also learned that they will be unable to play in next season's Europa League, should they win the FA Cup.
They did not apply for the required UEFA club licence by the March 1 deadline and although they can submit a retrospective application, their current financial status means it is unlikely that a licence will be granted by UEFA.
In Tuesday's other Premier League match, Sunderland claimed their first league win since November by crushing Bolton 4-0 to ease their own relegation worries.
Darren Bent scored his first hat-trick for Sunderland, to help the north-east side move up to 13th in the Premier League table with their first win in 15 matches.
Fraizer Campbell opened the scoring after just 44 seconds, when he latched onto Lorik Cana's cross to guide the ball past goalkeeper Jussi Jaaskelainen.
Bent opened his account by doubling the home side's lead, out-pacing defender Sam Ricketts to fire home a Lee Cattermole pass in the 64th minute.
Ricketts was then sent off 10 minutes later, receiving a second booking for fouling Bent in the area.
The former Tottenham striker dusted himself down to convert the resulting penalty and he completed his hat-trick with two minutes remaining when netting Campbell's inch-perfect cross.