Stuart Bingham beat defending champion Ding Junhui 6-5 to reach the final of the Welsh Open at the Newport Centre.
Bingham, 36, was 2-0 and 4-2 ahead before Ding won three successive frames to take a 5-4 advantage.
However, Bingham compiled a break of 93 to make it 5-5 before clinching victory with a 108 break in the deciding frame.
China's Ding, 25, had moved to within a frame of reaching his second Welsh Open final in a row when Bingham conceded the ninth frame after missing the black off the penultimate red.
But world number 10 Bingham fought back to take the last two frames and win a thrilling contest.
The other last-four meeting also switched back and forth as 2011 UK Championship winner Trump raced into a 2-0 lead before Maguire replied with the next five frames.
Trump refused to back down, however, and a break of 86 moved him to within a frame of Maguire at 5-4.
The world number six then held his nerve to to set up a showdown with Bingham which will be decided in the best of 17 frames with £50,000 on offer for the winner.