Regan Fitz and Elliot Mason have been enemies since they started training to become Glitchers--people who travel through time to preserve important historical events. But everything changes when they find a letter from Regan's future self, warning them about an impending disaster that threatens them and everyone they know. Will they be able to set aside their past in order to save the future?--Amazon.com

"Just once, Frank Pearl would like to win at something! He is going to win a prize if it's the last thing he does. Could an amazing yo-yo trick or Cookie the parrot land him a prize? Could a blue ribbon be his at the Great Third-Grade Breakfast Bash? With three shots at a prize and Judy Moody cheering him on (sort of?), there's no way that Frank can miss out on a trophy this time" --

"Competitive siblings Sadie and Clip Chu must set aside their differences and work together when they get stuck in a virtual reality laser tag game"--

Eight boys and girls compete for a spot on the space voyage that will search for a source to solve Earth's energy crisis.

Meg goes to Maker School to hone her talent for building with boxes -- but when Simone, another boxitect, arrives -- they become so competitive they nearly fail in the annual Maker Match.

When his teammate Stu is injured during practice, Manny promises to keep quiet so he can play, but then Stu starts acting funny, and Manny struggles with whether to keep his silence or break his promise and let his team down.

Dana and the rest of the Raiders gymnastics team believe that hard work and practice are the way to win--so how will they fare against the Superiors, a team with a reputation for dirty play and cheating?

"When Joey has to compete with his best friend, Zach, for a single spot on an elite baseball team, he is forced to decide how far he is willing to go to win"--

Patryk and Jurek are as much friends as rivals in the small Russian-occupied Polish village where they live. When, in August 1914, Patryk finds an old button on the forest floor, Jurek becomes wildly jealous. Not long after, World War I comes to Poland, bringing one invading army after another to the village. Jurek devises an exciting dare among the seven boys in their pack: whoever steals the best military button will be Button King. The boys agree....

"Amy hurt her knee in a race. Now she's back on the team, but will have to get her confidence back in order to compete"--Unedited summary from book.