Roberts and Summers, who bat in the two and three spots, were both 3-3 with a walk and a stolen base in the ballgame.
Roberts knocked in 1 run and scored all four times she was on base and Summers knocked in three with a single, double and a triple, and scored twice.
"That makes your coach not have a heart attack when they hit like that," said a happy MCHS head coach Holly Cook after the ballgame.
Cook added, "KiKi had a big game. She is focused right now and is seeing the ball well and that makes us loosen up on defense and not be so tight when we got more than one or two runs. I think that just helps the overall confidence of the team."
Wallace turned in a lunch pail effort in the circle, scattering just five hits, striking out 9 Lady Lions, and issuing two bases on balls in the shutout win.
Freshman Austyn Whaley went 2-3 with an RBI double and Mary Medley, Kathryn Haislip, and Danielle Toseland all had one hit and one run scored.
The Tigerettes scored in the bottom of the first on a two-out RBI laser into the right center gap by Summers that scored Roberts, who had blooped a single into left field.
The duo teamed up again in third with two down and nobody on when Roberts walked and Summers single sharply to left.
Roberts had to stop at third, but was not there long as Summers took off for the steal of second on the next pitch and was safe.
Roberts scored easily on the late throw home, making it 2-0.
The game went to the bottom of the fifth and the Tigerettes put four runs on the board, beginning with a one-out hit by Toseland.
Summers came across on a passed ball for run number five.
After a strikeout, Medley bashed a two-out double into center field and Whaley knocked her home with a clean single to left.
Wallace got out of another two-on, two-out spot in the sixth on a pop-up to Roberts at short and the Tigerettes added three more runs in the bottom of the inning, taking a commanding 9-0 lead into the 7th.
Wallace fanned the first Lady Lion and then induced a grounder to Roberts for the second out before the game ended when Wallace caught a pop-up near the first base line.
The Tigerettes will be back in action on Monday and Tuesday, hosting a pair of District 12-AA rivals, beginning with East Hickman at 7:00 p.m. on Monday and Spring Hill at 5:00 p.m. Tuesday.