article_snippet.sent: It wasn't clear why he dropped out.
article_snippet.sent: , 38 seconds made he one of the biggest threats to defending champion Meb Keflezighi's hopes of repeating Monday.
article_snippet.sent: It was he first win at the event .
article_snippet.sent: It took Marcel 1:29:53 for Marcel first Boston win.
article_snippet.sent: The 28-year-old finished fourth last year.
article_snippet.sent: The Russian-born adoptee and Maryland native also finished second in the 1 kilometer Nordic skiing sprint in the 2014 Paralympics.
article_snippet.sent: Crowds at the event were smaller this year, thought to be due to weather.