John Gibbons does not pretend to be historian.

However, the Toronto Blue Jays manager knows that first baseman Edwin Encarnacion must be making some history with the way he is hitting this month.

"Don't know what to tell other than it's pretty amazing," Gibbons said. "He's a special guy, and he's locked in right now. I don't know where it goes down in history, but it's pretty historic in my mind."

Encarnacion hit a pair of two-run homers off James Shields on Thursday in the Blue Jays' 8-6, 10-inning loss to the Kansas City Royals, giving him 18 homers for the season. He has 16 homers in May, a club record for any month. He also has five multi-homer games in May, which equals the major league record for any month set by Harmon Killebrew in May 1959 and equaled by Albert Belle in September 1995.

The 16 homers in May are one short of the major league record of 17 set by Barry Bonds in 2001. Encarnacion matched the number of homers hit by Mark McGwire in May 1998 and Mickey Mantle in May 1956.

Encarnacion still has two games left in the month, so he may not be finished.

"It's unbelievable," shortstop Jose Reyes said. "Hopefully he can continue to hit like that, continue to be hot because we need it."