Sam Hodde/Getty ImagesAfter Kyrie Irving's 40-point performance wasn't enough to get past the Los Angeles Clippers on Sunday, his Dallas Mavericks co-star Luka Dončić said he feels like he's not doing enough, per ESPN's Tim MacMahon."I feel like I'm letting him down," Dončić said. "… I got to help him more."Dončić, who had 29 points, 10 rebounds and 10 assists in the 116-111 loss, has been dealing with right knee soreness, but he said that while he's "obviously hurting," it's not an excuse.The Clippers evened the series at two games apiece with the win on Sunday.Dončić has averaged 29...…Sam Hodde/Getty ImagesAfter Kyrie Irving's 40-point performance wasn't enough to get past the Los Angeles Clippers on Sunday, his Dallas Mavericks co-star Luka Dončić said he feels like he's not doing enough, per ESPN's Tim MacMahon."I feel like I'm letting him down," Dončić said. "… I got to help him more."Dončić, who had 29 points, 10 rebounds and 10 assists in the 116-111 loss, has been dealing with right knee soreness, but he said that while he's "obviously hurting," it's not an excuse.The Clippers evened the series at two games apiece with the win on Sunday.Dončić has averaged 29...WW…