After making three appearances, including one start, for the Royals in April, going 0-1 with a 5.73 ERA, the southpaw was sent back down to Triple-A Omaha.
Teaford dominated the seven appearances (six starts) he made in the Minors, recording a 4-0 record and a 1.09 ERA. He allowed just 24 hits and four runs in his 33 innings in Omaha.
Teaford returned to Kansas City on Wednesday for his first Major League start since April 27 and showed signs of success.
He tossed five solid innings, giving up just four hits and two runs, both of which came in the sixth inning before he was pulled.
"He got through five and he just kind of ran out of gas," Royals manager Ned Yost said.
Teaford (0-1, 5.06 ERA) received a no-decision, and chalked up his early exit to the 97-degree heat.
"Being honest, yes," Teaford said, acknowledging that he struggled with the beating sun. "But I've got to get through that."
Teaford will look to do just that Monday as he faces the Blue Jays in the sixth start of his MLB career.
He pitched three innings against Toronto earlier this season, receiving his first and only loss of the season.
Teaford walked three and allowed three runs in relief duty, including a two-run blast by Colby Rasmus.
This time, Teaford will get the start against Ricky Romero (8-2, 4.94 ERA).
Romero is Toronto's No. 1 starter and pitched like it for much of the start of the season. His eight wins and 70 strikeouts lead the team, but the lefty is coming off a rough stretch recently.
Romero allowed nine runs (eight earned) on seven hits with six walks Wednesday against Boston and has surrendered at least four runs in seven straight outings.
"At the end of the day, it's one thing, and that's just not being consistent in the zone," Romero said. "That's something I was good at last year and early on in the year. Right now, it seems like when I'm missing, I'm missing bad. I'm not even coming close. I don't know, I don't know. It's just disappointing."
In his most recent outing Wednesday, Romero threw 90 pitches, only 48 of which were strikes.
"I think I'm going to dissect myself a little more in the video room and see what's different this year from at the end of last year," Romero said. "I'm embarrassed in myself more than anything. I felt like I let the team down."
Blue Jays: Injuries take toll on staff
Toronto has proved that one week can change an entire season.
The Blue Jays lost three starting pitchers in the span of one week. Kyle Drabek underwent Tommy John surgery earlier in June, Drew Hutchison was put on the 60-day disabled list for a sprained right shoulder and Brandon Morrow is also out with a left oblique strain.
All three starters had compiled double-digit starts for Toronto and had combined for 16 wins.
While Drabek is out for the season, there is still no timeline for Hutchinson or Morrow.
Morrow began making progress this week, beginning a light throwing program, tossing from distances of 60 and 90 feet.
The three additional losses brings Toronto's total to six pitchers currently on the injury report.
Jays right fielder Jose Bautista was selected as a starter for the 2012 All-Star Game.
Bautista, who is now a three-time All-Star, has led the Majors in home runs the past two seasons and is currently the league leader with 26 long balls this season.
But much of the clubhouse talk wasn't around Bautista's deserved starter role, but rather the Edwin Encarnacion's All-Star snub.
"I think Edwin is very much deserving," manager John Farrell said. "He has had an outstanding year for us. Really when you look at the first six weeks of the season, he was our guy."
The 29-year-old designated hitter/utility man is batting .291 with 22 home runs and 55 RBIs.
Royals: Butler set for first All-Star game at home
Billy Butler was selected as the lone Royals All-Star to play in front of his home crowd.
Kansas City hosts this year's Midsummer Classic, and unless Royals closer Jonathan Broxton wins the American League 2012 All-Star Game MLB.com Final Vote presented by Firestone, Butler will be the only hometown team player to appear in the All-Star Game.
"I'm very humbled and very honored, especially at our own ballpark and being able to play in front of the home crowd," Butler said. "My family is going to come out to see me play and do all the activities on the field. I'm just speechless right now."
Butler is batting .297 this season with 16 home runs and 48 RBIs.
He was selected by AL manager Ron Washington in conjunction with Major League Baseball.
Kansas City recorded a 14-13 record in June, following a 15-13 record in the month of May. The back-to-back winning months were the first for a Royals club since 2007.