Francisco Alvarez's solo home run in the bottom of the ninth inning lifted the New York Mets to a dramatic 4-3 win over the Baltimore Orioles in Monday's opener of an important three-game series for both teams.

With one out and the game tied at 3-3, Alvarez crushed a 3-0 fastball from Seranthony Dominguez well clear of the wall in left center field to allow the Mets to close the gap in the National League wild card race and knock the Orioles out of first place in the American League East.

J.D. Martinez had a two-run homer in the first inning for New York, which moved within 1 1/2 games of the Atlanta Braves for the NL's final wild card spot with its third win in four games.

The Orioles have now lost three of four and dropped a half-game back of the idle New York Yankees for the AL's top spot.

Baltimore made it interesting, however, by scoring twice in the seventh inning to erase a 3-1 deficit.

Ryan Mountcastle began the rally with a lead-off double and took third on a groundout before being forced home when Mets starter David Peterson was called for a balk. Ramon Urias then followed with a solo home run to knot the score at 3-3.

Peterson had been cruising up until that point and departed after allowing three runs - two earned - while striking out eight through seven innings.

Martinez followed a first-inning single by Mark Vientos with his 13th homer of the season to give the Mets an early advantage. They increased the margin to 3-0 in the fourth when Pete Alonso doubled and later crossed the plate on Tyrone Taylor's two-out single.

The Orioles answered in the fifth with the help of an error by Peterson, who threw errantly on a pickoff attempt to send Urias to third after the infielder reached on a double. Urias would then score on a groundout by Jackson Holliday.

Urias and Mountcastle each finished with two hits for the Orioles, while Baltimore starter Trevor Rogers struck out five while permitting three runs in 4 2/3 innings.

Diaz's homer in ninth caps rally, keeps Astros hot

The Houston Astros also earned a key win via a walk-off home run, as Yainer Diaz's ninth-inning blast gave the AL West leaders a 5-4 comeback victory over the Boston Red Sox.

Houston scored once in each of the final two innings to rally for its 11th win in 12 games, with Diaz delivering the final blow by launching Kenley Jansen's pitch well over the left field wall with one out in the bottom of the ninth.

The Astros tied the game at 4-4 with a two-out rally an inning earlier, as Chas McCormick singled off reliever Lucas Sims and stole second before racing home on Mauricio Dubon's clutch single.

Yordan Alvarez and Victor Caratini each collected three hits to help Houston increase its lead over the second-place Seattle Mariners to five games in the division.

The slumping Red Sox lost for the eighth time in 12 games despite taking a 4-2 lead on Masataka Yoshida's pinch-hit two-run homer off reliever Tayler Scott in the top of the sixth inning. Romy Gonzalez was aboard for the blast after reaching on an error by Houston second baseman Jose Altuve, one of a season-high four miscues for the Astros.

Houston got closer in its half of the sixth, however. Back-to-back singles by Jeremy Pena and Caratini put runners on first and third for Jon Singleton, who drove in Pena with a sacrifice fly to trim the lead to 4-3. 

Astros starter Yusei Kikuchi struck out seven over 5 2/3 innings while allowing three runs, one earned, though his night began ominously when Boston's Jarren Duran connected on his 16th homer of the season on the game's first pitch.

Rob Refsnyder and Rafael Devers each singled later in the first inning before another Houston error - a misplay by rookie third baseman Shay Whitcomb - enabled another run to score.

The Astros were held scoreless by Tanner Houck through the first three innings before breaking through in the bottom of the fourth, which Alvarez began with a double and Diaz followed with a single. Alvarez was later thrown out at home on a fielder's choice grounder, but Caratini singled in Diaz and Pena also scored on the play on an errant throw by Boston catcher Danny Jansen.

Houck worked six innings and struck out eight while surrendering three runs - two earned.

Stone, Muncy propel Dodgers over Mariners in Turner's Los Angeles return

Gavin Stone racked up a career-high 10 strikeouts in seven innings, Max Muncy homered in his first game back from the injured list, and the Los Angeles Dodgers spoiled Justin Tuner's return to Dodger Stadium with a 3-0 win over the Seattle Mariners.

Muncy, sidelined since May 16 by a right oblique strain, came through with a two-run homer in the seventh inning to back Stone's superb start and help the Dodgers win the opener of this three-game series between playoff hopefuls.

Gavin Lux homered earlier in the seventh to break a scoreless deadlock and a terrific pitching duel between Stone and Bryan Woo, who had allowed just one hit until Lux drove a pitch over the wall in center field.

Woo (5-2) then hit Will Smith with a pitch and was removed in favour of Yimi Garcia, who was greeted by Muncy's towering drive to right that quickly made the lead 3-0.

Stone (11-5) yielded just two hits and two walks before departing, with Joe Kelly pitching a scoreless eighth before Evan Phillips retired the side in order in the ninth to notch his 16th save.

Woo was charged with two runs in 6 1/3 innings in slumping Seattle's sixth loss in seven games. The defeat dropped the Mariners five games back of first-place Houston in the AL West.

Turner went 1 for 3 in his first appearance at Dodger Stadium in nearly two years. The 39-year-old infielder made two NL All-Star teams during a successful nine-year tenure with the Dodgers from 2014-22. 

The San Diego Padres tied up the NLDS against the Los Angeles Dodgers with a nail-biting 5-3 victory in a game that included five solo home runs on Wednesday.

Manny Machado played a key role going two-for-five, including a first-inning solo homer along with a third-inning RBI, while Jurickson Profar got his fifth RBI this postseason to put the Padres up 4-3 in the sixth inning.

Jake Cronenworth added another with a solo blast over right-field in the eighth inning before Josh Hader closed it out.

Yu Darvish pitched five innings with seven strikeouts but allowed seven hits and three runs.

The Dodgers had their chances, with nine batters left on base, while they did not have a hit with a runner in scoring position all night.

Freddie Freeman, Max Muncy and Trea Turner all scored solo home runs for the Dodgers. Freeman, who went two-for-four, got on base with a ninth-inning double but Will Smith was caught short of the wall in right-field by Juan Soto to end it.

Clayton Kershaw had six K's across five innings for the Dodgers, restoring his position as the MLB's all-time leading postseason strikeout leader with 213.

Pitcher Brusdar Graterol made a key play down 4-3 in the sixth inning, throwing out Wil Myers at home from a Trent Grisham bunt, but the Dodgers could not capitalise with the Padres' bullpen again exceptional, led by Robert Suarez.

The next two games of the NLDS are at Petco Park where the Padres will be playing in front of their fans in a postseason game for the first time since 2006.

Wright leads Braves to level up with Phillies

Kyle Wright threw six stellar innings as the Atlanta Braves squared the NLDS as they blanked the Philadelphia Phillies 3-0.

After a lengthy rain delay, Wright allowed only two hits with one walk, whilst striking out six Phillies, before reliever A.J. Minter pitched a perfect seventh inning.

The Braves piled on all three runs in the sixth inning with three consecutive two-out singles, as Ronald Acuna Jr overcame a 96mph fastball from Zack Wheeler to his elbow to break the tie, driven in by Matt Olson whose line hit got by first baseman Rhys Hoskins on an in-between hop.

Austin Riley's gentle dribble got Dansby Swanson to home plate, before Travis d'Arnaud grounded to center-field to drive in Olson.

Max Scherzer delivered 11 strikeouts across seven innings to cap a perfect day for the New York Mets who swept their divisional double-header with the Atlanta Braves on Saturday.

The Mets got past the Braves 8-5 in the matinee game, followed by a 6-2 victory in the evening led by Scherzer's impressive outing.

The wins were critical in the National League (NL) East where the Mets improved to a 69-39 record ahead of the reigning world champions at 64-45.

Scherzer was at his vintage best for the Mets, amid tension given the Braves had recently closed in on Mets in the race for first place ahead of the five-game series.

"This is what you play the game for," Scherzer said. "You play to face the best, especially deep in the season. You grind it out here in the NL East."

Scherzer's 11 KS means he sits fourth on the all-time MLB list for most 10 or more strikeout games by a pitcher with 109, behind Nolan Ryan (215), Randy Johnson (212) and Roger Clemens (110).

Yankees shut out as Montgomery stars

Jordan Montgomery came back to haunt his former employers only days after being traded as the St Louis Cardinals defeated the New York Yankees 1-0.

Montgomery pitched five scoreless innings for the Cardinals who triumphed courtesy of Paul Goldschmidt's first-inning run driven in by Nolan Arenado.

The Cards new left-handed pitcher, who was involved in the trade deal for Harrison Bader, only managed one strikeout but only allowed two hits and a walk.

Dodgers edge divisional rivals

Max Muncy's fifth-inning go-ahead three-run blast helped the Los Angeles Dodgers topple the San Diego Padres 8-3 in their National League (NL) West battle.

The Dodgers were trailing 3-2 at the time, but Muncy's intervention turned the tide. The Dodgers extend their lead in the NL West with a 74-33 record compared to the Padres who are 61-49.

The home run was Muncy's 11th for the season. Will Smith also had a solo home run, to finish with three hits with two runs and three RBIs.

League leader Aaron Judge continued his remarkable form after the All-Star Game with his 43rd home run of the season as the New York Yankees flexed with a 7-2 win over the Seattle Mariners on Monday.

Judge made majors history with his 10th home run since the All-Star Game, joining Albert Belle in achieving that feat in only 12 games after the break.

The Yankees outfielder had hit a first-inning double, before Anthony Rizzo's three-run blast – his 26th home run of the season – opened up an early 3-0 lead.

Judge took center stage in the second inning with his home run putting the Yankees up 5-1, marking 12 blasts in his past 14 games.

Jose Trevino got in on the act, after a lean month, with home runs in the fourth and eighth innings for his first career multi-homer game.

The result keeps the Yankees top of the American League (AL) East with a 70-34 record, while the Mariners are second in the AL West with a 55-49 record.

Judge leads the majors for home runs this season with 43 with a league-high .680 slugging percentage, batting at .299 with 89 runs, 115 hits and 93 RBIs.

Hot property Soto stars as Mets see off Nats

Amid trade speculation, Juan Soto underlined his value with the Washington Nationals with a fine all-round performance in their 7-3 loss to the New York Mets.

Soto showed off his speed around the bases to score for 1-0 in the first inning, before some brilliance from the outfield saw him throw out runner Tomas Nido on the home plate.

After Pete Alonso's 27th blast of the season put the Mets 4-1 up, Soto returned fire with his own home run in the fourth inning, his 21st of the year.

Francisco Lindor's sixth inning homer rounded out the win for the Mets who improve to 65-37.

Dodgers too strong for Giants

Max Muncy and Trea Turner both homered as the Los Angeles Dodgers proved too good for National League (NL) West rivals San Francisco Giants 8-2.

Muncy's second-inning two-run blast put the Dodgers ahead after Darin Ruf scored in the first, with Freddie Freeman driving in Mookie Betts in the fourth to open up a 4-1 lead.

Turner unleashed his 17th home run of the season at the top of the seventh inning with a fly ball to center field to settle the contest, helping the Dodgers move to 69-33 at the top of the NL West.

Max Muncy says missing the National League Championship Series (NLCS) is "one of the worst things" he's experienced after the Los Angeles Dodgers confirmed the injured first baseman's absence.

The Dodgers released their 26-man roster for the NLCS on Saturday prior to the 3-2 walk-off loss to the Atlanta Braves in Game 1 with Muncy left off after dislocating his left elbow in the side's regular season finale on October 3.

Dodgers general manager Dave Roberts said earlier this week there was a "small chance" Muncy would return for the NLCS.

Muncy led the Dodgers for home runs and RBIs across the regular season, hitting at .249. The 31-year-old two-time All-Star hit 36 home runs and 94 RBIs.

"Not playing has been one of the worst things I've ever had to experience," Muncy told reporters.

"It’s one of those things that it’s still really painful and you try and get through it and trying to see where we’re at. I’ve had better days."

Muncy is still wearing a large arm brace, while the Dodgers nor the player have revealed if he has resumed any baseball activities over the past fortnight.

He remains hopeful that he could play in the World Series, which is due to start on October 26, should the Dodgers qualify.

"I’m hoping it’s very realistic," Muncy said. "We’re talking to some doctors and trying to figure out exactly what the next steps will be."