The Houston Astros beat the Texas Rangers in a tense MLB clash, while the Milwaukee Brewers had an extra-inning win.
Trailing by a run in the top of the sixth, Astros starting pitcher Lance McCullers Jr. threw behind Mike Napoli, igniting both benches and bullpens to clear as tensions rose.
Napoli took a few steps to the mound but seemed to remain calm while his team-mate Choo Shin-soo jumped from the dugout and escalated the incident.
No punches were thrown but expect tensions to remain high between the teams, with the Astros claiming a 6-2 win in the opener of the four-game series.
The Brewers needed 10 innings but eventually got past the St Louis Cardinals 7-5.
The Toronto Blue Jays crushed the New York Yankees 7-1, the Baltimore Orioles beat the Boston Red Sox 5-2 and the Detroit Tigers were 7-1 winners against the Cleveland Indians.
The Cincinnati Reds had a 10-inning, 4-3 win over the Pittsburgh Pirates, the Tampa Bay Rays edged the Miami Marlins 4-2 and the New York Mets overcame the Atlanta Braves 7-5.
The Philadelphia Phillies thrashed the Chicago Cubs 10-2, the Kansas City Royals eased past the Chicago White Sox 6-1 and the San Francisco Giants closed out a 4-3 win over the Los Angeles Dodgers.
Brewers slugger Travis Shaw broke a 4-4 tie with the Cardinals with two outs in the top of the 10th, blasting an estimated 414-foot, three-run shot off reliever Oh Seung-hwan (0-2).
After becoming public enemy number one in Boston due to a spikes-up slide on Dustin Pedroia last month, the Orioles' Manny Machado was not exactly sprinting around the bases after blasting a home run over the Green Monster in a win over the Red Sox.
Manny fears no Monster. pic.twitter.com/Zv6YgKB4fx-- MLB (@MLB) May 2, 2017
PHILLIES PUNISH ANDERSON
After a lengthy rain delay, the Phillies poured it on Cubs starter Brett Anderson for seven earned runs on seven hits in just 1.1 innings of work at Wrigley Field. The Phillies' Aaron Altherr had two doubles and three RBIs before Anderson was pulled in the blowout loss.
INDIANS AT TIGERS
A pair of Cy Young Award winners square off, each looking to regain their form. Corey Kluber (3-1, 4.19 ERA) is allowing a career-high 1.57 homers per nine innings this season and faces a tough Tigers (13-12) lineup while Justin Verlander (1-2, 4.60 ERA) looks to rebound from an ugly loss to the Indians (14-11) last month. He should receive a boost of run support as Miguel Cabrera (right groin strain) returns from the disabled list.