Defending champion Dino Castillo maintained his lead after Wednesday’s second round of the 2023 USBC Senior Masters at Sam’s Town in Las Vegas. That meant the key battle Thursday will be for 64th, rather than 63rd since the defending champion is guaranteed a spot in match play so if Castillo were down the standings, 63rd would be the key spot. After totaling 1,265 for five games in Tuesday’s first round, Castillo fired games of 258, 225, 190, 265 and 176 for 1,114 in the...