TONKAWA — Cassie Manning and Gianfranco Grafals were named Northern Oklahoma College-Tonkawa Student Athletes of the Week. Manning is a freshman from Glencoe and Grafals is a freshman from Jacksonville, Fla. For the week, Manning averaged 21.5 points per game, 3.5 rebounds per game, 2.5 assists per game, shot 56 percent (15-27) from the field, and 48 percent (9-19) from the 3-point line. …