Day Air Ballpark, formerly known as Fifth Third Field, is a minor league baseball stadium in Dayton, Ohio, which is the home of the Dayton Dragons, the Midwest League affiliate of the nearby Cincinnati Reds. In 2011, the Dragons broke the all-time professional sports record for most consecutive sellouts by selling out the stadium for the 815th consecutive game, breaking the record formerly held by the Portland Trail Blazers.

Dayton is a city in and the county seat of Montgomery County, Ohio, United States. A small part of the city extends into Greene County. As of the 2020 census, the city proper had a population of 137,644, making it the sixth-most populous city in Ohio. It anchors the state's fourth-largest metropolitan area, the Dayton metropolitan area, which had 814,049 residents. Dayton is located within Ohio's Miami Valley region, 50 miles (80 km) north of Cincinnati and 60 miles (97 km) west of Columbus.