Each week during the high school sports season, High School on SI will gather the best performances across the country with the help of fans, readers and staff. Now, it’s your turn to choose a standout among the pack, the best of the best. Here are the nominees for High School on SI’s National High School Girls Athlete of the Week for April 20-26. Voting closes on Sunday, May 3 at 11:59 p.m. (Pacific Time). The winner will be announced in the following week’s National High School Girls Athlete of the Week post.  The poll is below the write-ups on each athlete. Congratulations to Natalya Horton of La Salle (New York) softball for winning last week’s National High School Girls Athlete of the Week poll. Horton, a Lenoir Rhyne commit, whirled a 13-strikeout perfect game in a 3-0 victory over Voorheesville.  Want to nominate an athlete? Email Bob Lundeberg at bob.lundeberg@gmail.com High School on SI National Girls Athlete of the Week nominees 1.…