With his brother watching from the stands, Mitty’s Kyle Peterson elevated his game Friday night and the Monarchs might have played their best contest of the season. The senior guard scored a season-high 23 points as Mitty (15-10) rolled to a 70-46 Central Coast Section Open Division first-round win over Serra at Santa Clara University. Peterson’s brother Connor, who along with Aaron Gordon led Mitty to state championships in 2011 and ’12, is a starting guard at Azusa Pacific, which is in the Bay Area for two games. Kyle Peterson, known for his defensive prowess, sank four of his team’s 10 three-pointers as the Monarchs spread out the Serra defense and led from start to finish. [...] at Santa Clara, Wrenn Robinson had 15 points and Matt Redmond, Teddy Snyder and Darrion Trammell chipped in 10 points apiece for the second-seeded Wildcats (20-5), who held off a late rally by the seventh-seeded Chieftains (22-3) in the CCS Open Division game. Junior Logan Johnson (18 points) and senior Jake Mihanovic (14 points) were their usual selves, but it was the play of Tyler Manoa (eight points, eight rebounds), Oscar Pedraza-V (12 points) and Maurice Wilmer (eight points) that proved decisive for St.