on a Sunday, and the second ever played during the month of August, the first having taken place on August 3, 1959. September 4 – In the conclusion of the longest game in Fenway Park history, the Seattle Mariners beat the Boston Red Sox 8–7 in 20 innings. The game began on September 3, but was suspended after 19 innings with the score tied 7–7. September 6 – Despite having won the first-half American League East title, New York Yankees manager Gene Michael is replaced by Bob Lemon, who managed the club in 1978–79. The Yankees are under .500 in the second half of the season. September 6 – The Los Angeles Dodgers' Fernando Valenzuela beats the St. Louis Cardinals 5–0 to tie the National League record of seven shutouts by a rookie pitcher. September 26 – Nolan Ryan of the Houston Astros breaks the record of four no hitters by pitcher Sandy Koufax by pitching his fifth career no hitter in the Astrodome against, coincidentally, Koufax's former team, the Los Angeles Dodgers. September 30 – The Kansas City Royals defeat the Minnesota Twins, 5–2, to clinch the second half of the American League Western Division title. More importantly, it is the last Major League game to be played at Metropolitan Stadium, as the Twins prepare to move into the new Hubert H. Humphrey Metrodome. October–December October 3 – Bob Horner hits two home runs and scores the winning run to give the Atlanta Braves a 4–3 win over the Cincinnati Reds, and the Houston Astros the second-half title in the NL West division. Cincinnati, which lost the first-half title to the Dodgers by half a game, will finish with the best overall record (66–42) in the major leagues, but will miss the playoffs as a result of not having won either half's division title. October 3 – The Milwaukee Brewers (playing since 1970) and Montreal Expos (since 1969) clinch their first postseason appearances. Milwaukee beats Detroit 2–1 to wrap up the second-half title in the AL East division, while Montréal edges the Mets 5–4 to win the NL East's second playoff spot. (St. Louis finishes with the best overall record in the NL East but misses the playoffs for the same reason as the Cincinnati Reds.) October 5 – The Kansas City Royals shut out Cleveland 9–0 in the first game of a scheduled doubleheader to clinch the second-half