John Rankin hailed goalkeeper Radoslaw Cierzniak for his League Cup penalty heroics - after the Dundee United man missed his spot-kick against Hibernian.
The quarter-final ended 3-3 at Easter Road and the first 12 penalties were scored in the shoot-out.
Rankin missed in sudden death but Matthew Kennedy followed suit before Connor Townsend scored and Cierzniak saved from David Gray to win it.
"I'm happy with Rado, he's pulled me out of a hole," said Rankin.
And the midfielder added: "When it goes to penalties and then sudden death we looked along the line and thought 'who's next, please don't make me take,' and then I thought 'I'm going to need to take'.
"I put mine over the bar but I'm absolutely delighted to be in the semi-final. Rado's a pleasure to have in the team.
"It's the first time we've been in the League Cup semi-final since I've been at the club, so it's progression."
United now go into Saturday's semi-final draw alongside Aberdeen, Celtic and Rangers.
And after surviving a scare against his former side Hibs, Rankin is buzzing to be in the last four.
"When it went to 3-2 I thought we'd see the game out and it was disappointing to concede again," he added.
"Coming here we knew it was going to be hard, we saw Hibs at the weekend against Hearts and they were very impressive. They've got a lot of good players in their ranks, they're just out of the Premiership last season and they look a better side this season.
"When you get to this stage it doesn't matter who you get, you play the game and not the occasion. In the Scottish Cup last season we had Rangers and the season before it was Celtic - they're in there this time and Aberdeen as well, so it's set up for a few tasty semi-finals."