Chelsea had the lead through Nicolas Jackson before Ebere Eze struck Palace's equaliser.
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Maresca said, "We completely deserved to win the game. We had many, many chances. The most important thing was the performance and the performance was there. We conceded just two shots today.
"We didn't take the three points but playing the way we did today, I think we will win games."
Asked if Palace's Will Hughes should have been sent off, Maresca continued:"This kind of thing for sure changes the game. It was clear second yellow card but the referee thinks in different ways.
"I feel a bit of shame for the result but not the performance. The direction is the correct one.
"With the players arriving now we can even better."