LOS ANGELES—Amir Coffey tied a career-high with 21 points and Serge Ibaka added 16 to lead the Los Angeles Clippers to a 106-93 win over the Atlanta Hawks on Sunday. Coffey, who went undrafted out of Minnesota in the 2019 NBA draft, is on a two-way contract with the Clippers and the G-League but has really blossomed this season. He made a big impact Sunday since the Clippers, like many NBA teams, are short-handed due to health and safety protocols and injuries. He made 8 of 12 field goals and 5 of 8 3-pointers. It’s been an up-and-down stretch for the Clippers, and while he’s made steady improvements, Coffey has had to navigate going from the G-League to the NBA and back-and-forth. “I just always tell myself it’s a marathon,” Coffey said. “There’s ups and downs. Good games and bad games, going back and forth. It’s about staying level-leaded in …