123rd Running of the Boston Marathon (2019)

Apr 15, 2019; Boston, MA, USA; Tatyana McFadden (center) at the women's wheelchair division start during the 2019 Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Memorial for the 2013 bombing on Boylston Street during the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; General view of the start of the men's elite group during the 2019 Boston Marathon. Mandatory Credit: Paul Rutherford-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Daniel Romanchuk of the USA crosses the finish line to win the Men's Wheelchair division in the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; A sign at the start of the Boston Marathon. Mandatory Credit: Paul Rutherford-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Daniel Romanchuk of the USA holds the trophy after winning the Men's Wheelchair division in the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; A general view of the Boston Marathon starting line. Mandatory Credit: Paul Rutherford-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Manuela Schar of Switzerland crosses the finish line to win the Women's Wheelchair division in the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Manuela Schar of Switzerland holds the trophy after winning the Women's wheelchair division in the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Dathan Ritzenhein (USA) and Jared Ward (USA) lead the pack at 15k during the 2019 Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Jared Ward (USA) leads during the 2019 Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Christopher Reischel holds an American flag at the Boston Marathon starting line. Mandatory Credit: Paul Rutherford-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Fans hold signs during the 2019 Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Fans hold signs during the 2019 Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Worknesh Degefa (ETH) reacts after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Worknesh Degefa (ETH) reacts after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Lawrence Cherono (KEN) crosses the finish line to win the 2019 Boston Marathon. Lelisa Desisa (ETH) finishes second. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Worknesh Degefa (ETH) and Lawrence Cherono (KEN) celebrate after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Lawrence Cherono (KEN) celebrates after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Worknesh Degefa (ETH) celebrates after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Lawrence Cherono (KEN) celebrates after winning the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Marcin Soszka reacts at the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Volunteers hand out medals at the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Nascar driver Jimmie Johnson poses with Men Keflezhighi at the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports

Apr 15, 2019; Boston, MA, USA; Desiree Linden (USA) reacts at the finish line in the 2019 Boston Marathon. Mandatory Credit: Brian Fluharty-USA TODAY Sports