[1] In his MLB career, Nelson pitched in 798 games with a 48–45 win–loss record, and with runners in scoring position and two outs he held batters to a .191 batting average against.

In 55 postseason games (third all time), he compiled a 2–3 record with 62 strikeouts and a 2.65 earned run average in 54+1⁄3 innings.

[4] Nelson made his major league debut with the Mariners on April 16, 1992, against the Chicago White Sox at Comiskey Park.

[5] On July 13, 1995, Nelson entered a game against the Toronto Blue Jays with two runners on base and no outs.

Nelson threw one pitch to Sandy Martínez and induced a ground ball triple play.

[7] In December 1995, the Mariners traded Nelson, Tino Martinez, and Jim Mecir to the New York Yankees for Russ Davis and Sterling Hitchcock.

[10] From 2001 to 2003, he formed the right side of Seattle's potent lefty/righty setup squad along with left-handed pitcher Arthur Rhodes.

Until the rule was changed in 2013, making a fake throw to third base a balk,[14] this was referred to as "the old Jeff Nelson" by Yankees play-by-play broadcaster Michael Kay.

[citation needed] He substituted for Suzyn Waldman on WFAN broadcasts of the final games of the Yankees regular season in October 2022, working with John Sterling.