Sentence:  And so it was over the weekend what with 40 - year old Warren Spahn pitching his no-hit masterpiece against the Giants and the Giants ' Willie Mays retaliating with a record tying 4 - homer spree <WSD>Sunday</WSD> . 
Meaning of the word marked with <WSD> tags:  first day of the week; observed as a day of rest and worship by most Christians