What Is 1999 National League Division Series

Overview

The 1999 National League Division Series (NLDS) marked the opening round of the National League postseason, determining which two teams would advance to the National League Championship Series (NLCS). As part of Major League Baseball’s playoff structure since 1995, the NLDS features two best-of-five series between division winners and wild-card teams.

This year’s matchups included the Atlanta Braves versus the Houston Astros and the Arizona Diamondbacks versus the New York Mets. Both series produced competitive outcomes, with each advancing a team to the NLCS for a shot at the World Series.

• Atlanta Braves vs. Houston Astros: The Braves won the series 3–1, advancing after clinching Game 4 on October 10, 1999, at Turner Field.
• Arizona Diamondbacks vs. New York Mets: The Diamondbacks won 3–1, with their decisive Game 5 victory occurring on October 11, 1999, at Bank One Ballpark.
• Regular season records: The Braves finished with a 103–58 record, best in the NL, while the Astros went 97–65 as the Central Division champions.
• Rookie impact: Arizona’s Kenny Lofton and Tony Womack provided key offensive spark, helping defeat the Mets in their first postseason appearance since 1988.
• Postseason format: The NLDS has used a best-of-five format since 1995, following MLB’s realignment into three divisions per league and the addition of the wild-card spot.

How It Works

The NLDS determines which two National League teams advance to the Championship Series based on a playoff format introduced in 1995. The matchups are determined by seeding division winners and the wild-card team, with home-field advantage awarded to the higher seed.

• Best-of-five format: The first team to win three games advances; all series are played within a seven-day window to minimize scheduling conflicts.
• Seeding rules: The team with the best regular-season record among division winners hosts up to three games, following a 2-2-1 home format.
• Wild-card eligibility: The wild-card team, regardless of record, cannot host Game 5 unless they are the higher seed, which was not the case in 1999.
• Player rosters: Teams submit a 25-player postseason roster, with no replacements allowed unless a player is injured before Game 1.
• Umpire rotation: MLB assigns a four-crew rotation that travels between series, ensuring consistency in officiating across playoff rounds.
• TV broadcasting: In 1999, FOX and ESPN shared coverage, with games aired nationally and regionally depending on team markets.

Comparison at a Glance

Below is a comparison of the two 1999 NLDS matchups, highlighting key statistics and outcomes:

The Braves and Diamondbacks both outperformed expectations, with Atlanta’s veteran core led by Greg Maddux and Tom Glavine proving dominant. Arizona, in just their second season, made history by reaching the NLCS, showcasing rapid franchise growth. The Mets, despite strong pitching from Al Leiter, faltered in critical moments. Houston’s loss marked the end of a strong season, with Randy Johnson winning Game 1 but unable to close the series.

Why It Matters

The 1999 NLDS was pivotal in shaping the postseason narrative and demonstrated the competitiveness of expansion teams and established franchises alike. It also highlighted evolving strategies in roster construction and playoff preparation.

• Expansion success: The Diamondbacks’ run in just their second season signaled MLB’s successful expansion into new markets like Phoenix.
• Veteran leadership: The Braves’ experience, led by Bobby Cox, gave them an edge in high-pressure NLDS games.
• Offensive performance: Teams averaged 5.2 runs per game in the NLDS, reflecting the high-scoring nature of late-90s baseball.
• Starting pitching: Atlanta’s rotation posted a 2.87 ERA across the series, emphasizing pitching depth as a playoff necessity.
• Postseason parity: The Mets and Astros both pushed their series to four or five games, showing improved competitiveness from non-division winners.
• Historical context: This NLDS was part of a five-year Braves dominance in the NL East, with four NL pennants between 1996 and 2001.

The 1999 NLDS not only advanced teams to the NLCS but also reinforced the importance of depth, experience, and timely performance in October baseball. These series remain notable for launching Arizona’s early success and extending Atlanta’s playoff legacy.