Alec Baldwin Attends US Open With Hilaria

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Alec Baldwin is showing his life is returning to normal following his dramatic "Rust" trial ... the actor was spotted out in New York on Monday night taking in all the tennis action at the US Open.

The 66-year-old was joined by his wife, Hilaria, for the occasion ... and while there weren't many big grins from the duo as they watched Novak Djokovic beat up Radu Albot in Arthur Ashe Stadium -- it's clear the two are moving on following the dismissal of Baldwin's involuntary manslaughter case.

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Alec was sporting a black suit and black tie for the event ... while Hilaria opted for a sleek green dress -- and they chatted…