The West Yorkshire club took a major step towards Premier League survival with a shock 2-1 win at Old Trafford.
Leeds’ win marks their first in the league at the famous ground since 1981, with the two goals coming from Noah Okafor.
In the 56th minute, Daniel Farke’s side were given a man advantage when Martinez was shown a straight red for pulling Calvert-Lewin’s hair.
Speaking on Sky Sports, Calvert-Lewin said: "It's a massive result for us. We came here to win, that's how we set up. We executed the game plan and came away with three points. We're delighted."
On Lisandro Martinez's sending off: "I don't know, I don't make the rules. I felt my hair get pulled, told the ref, he makes the decisions. Unfortunate for him, whether he's meant it or not. I hold no grudges."