Infield is a widely used term in sports terminology, its meaning depends on the sport in which it is used.

In baseball the baseball diamond plus a region beyond it (see diagram), has both grass and dirt, in contrast to the more distant, usually grass-covered outfield. It also refers to the defensive unit of players that are positioned in the region: first baseman, second baseman, shortstop, third baseman and sometimes including the catcher & pitcher who are as a tandem often referred to separately as the battery.

In cricket infield is a central oval on the cricket field (see diagram), the reference point for fielding restrictions in short forms of the game; in contrast to the more distant outfield

Infield can refer to a region inside a closed horse racing or auto racing track, or to an area encircled by the track of a roller coaster.

Justin Morgan Wayne (born April 16, 1979, in Honolulu, Hawaii) is a former American professional baseball pitcher. Wayne is from Honolulu, Hawaii, and an alumnus of Punahou School (the high school that Barack Obama attended).

Wayne was named an All-Hawaii baseball player as a senior in high school, where he was a 2-time league leader in strikeouts. He also ran cross country and played soccer.

At Stanford University, where he was an Economics major, as a freshman in 1998, Wayne went 6–0 with 6 saves while working exclusively out of the bullpen. After the season, Wayne was named 1st-team Freshman All-American by Collegiate Baseball, 2nd team Freshman All-American by The Sporting News, and honorable mention All-Pac-10.

In 1999, as a sophomore, Wayne had a perfect 10–0 record as a starter (he started all 21 games in which he appeared), striking out 135 batters in 118 innings. He helped lead the Cardinal to the College World Series, where they finished in 3rd place.

Wayne was an All-American pitcher in 2000, as he led Stanford to the College World Series final. He finished the 2000 season with a 15–4 record and a 3.21 ERA. Wayne was named co-Pac 10 Pitcher of the Year.