United, cruelly denied a place in the last eight by Motherwell's injury time equalizer last month, secured the victory it felt it deserved first time around thanks to Welsh's 67th minute goal Tuesday.
The big center-back scored with his 'wrong' foot, his right, to give United a 1-0 win in the fourth round replay.
Celtic, watched by a meager crowd of 10,882, scored a 1-0 premier division victory over Kilmarnock, John Collins hammering a 25-meter free kick in off the defensive wall in the final minute.
In Holland on Tuesday, Heerenveen goalkeeper Carlo l'Ami dashed Feyenoord Rotterdam's hopes of increasing the pressure on first division leader Ajax Amsterdam with several spectacular saves in their 0-0 draw.
Both teams found the back of the net -- but the goals were ruled out for offside.
The result left Feyenoord in second place in the table on 36 points, four behind Ajax.
A Message from The Moscow Times:
Dear readers,
We are facing unprecedented challenges. Russia's Prosecutor General's Office has designated The Moscow Times as an "undesirable" organization, criminalizing our work and putting our staff at risk of prosecution. This follows our earlier unjust labeling as a "foreign agent."
These actions are direct attempts to silence independent journalism in Russia. The authorities claim our work "discredits the decisions of the Russian leadership." We see things differently: we strive to provide accurate, unbiased reporting on Russia.
We, the journalists of The Moscow Times, refuse to be silenced. But to continue our work, we need your help.
Your support, no matter how small, makes a world of difference. If you can, please support us monthly starting from just $2. It's quick to set up, and every contribution makes a significant impact.
By supporting The Moscow Times, you're defending open, independent journalism in the face of repression. Thank you for standing with us.
Remind me later.