Walls is a 24-year-old shortstop who had never played above Double-A until this season. He was called up from the minors after shortstop Willy Adames was traded to Milwaukee on Friday.
Walls doubled in the ninth and later scored on a wild pitch and an errant throw to third by catcher Danny Jansen.
After scoring 72 runs during the first eight wins, Tampa Bay generated just enough offense. Five Rays combined on a six-hitter to send Toronto to its fourth straight loss.
Rays starter Shane McClanahan allowed one run and four hits in five innings. Andrew Kittredge (4-0) threw a scoreless seventh and Diego Castillo worked the ninth to get his eighth save.
Toronto’s Robbie Ray gave up one run, five hits and struck out seven in seven innings. The lefty has fanned 49 and walked just one over his six starts.
After Anthony Castro (0-1) intentionally walked Brandon Lowe with a runner on second and one out in the eighth, Margot singled to put the Rays up 2-1.
Castro was reinstated from the 10-day injured list before the game after being sidelined by a right forearm strain.
Zunino tied it at 1 in the fifth on his 11th homer.
Vladimir Guerrero Jr. drew a two-out walk off McClanahan in the first and scored on Teoscar Hernández’s double. Hernández has 20 RBIs in 21 games since returning from the COVID-related IL.
Tampa Bay had a streak of scoring seven runs or more in six straight games end. The Rays had also had hit three or more homers in five consecutive games, which was one away from the longest streak in major league history of six set by the 1987 Baltimore Orioles.
Walls was recalled from Triple-A Durham. “The past 12 hours has felt like five days,” Walls said. “The events, they’re happening so fast. There’s no way all this could happen in just 12 hours.” … RHP J.P. Feyereisen, also acquired from the Brewers, worked a scoreless sixth.
When Rays 1B Ji-Man Choi struck out swinging in the fifth, he lost control of his bat and it wound up in shallow right field.
Rays: RHP Michael Wacha (right hamstring tightness) could be back in the next couple days.
Blue Jays: 3B Cavan Biggio was placed on the 10-day IL with a cervical spine ligament sprain. … CF George Springer (right quadriceps strain) is running sprints at 50-60 percent.
Blue Jays LHP Hyun Jin Ryu (4-2) will start on Sunday. Tampa Bay has not announced its starter
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