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NEW YORK (AP) - Michael Taylor homered in his big league debut, setting off a silly sequence to retrieve the souvenir, and the Washington Nationals backed Doug Fister with four long shots Tuesday night in a 7-1 romp over the New York Mets.

Bryce Harper homered early, then Anthony Rendon, Ian Desmond and Taylor connected in the sixth inning as the NL East leaders won their ninth straight at Citi Field.

Promoted from Triple-A over the weekend, Taylor singled in his first at-bat and later hit a two-run drive the opposite way at one of the majors' most spacious parks.

A ball boy ran out to right field to pick up Taylor's home run ball, but mistakenly tossed it to a young fan in the stands. Alerted to his error, the ball boy and a couple of security guards quickly worked out a trade of another ball to reclaim the prize.

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