HeadStrong December 31, 2020 1:29 pm HeadStrong: Marcus Smart on his bout with COVID-19 As part of our month long series HeadStrong and our look at men’s health issues, Marcus Smart talks about his bout with COVID-19, and donating his plasma to help others fight the disease Celtics Videos 2:38 Joe Mazzulla: Kristaps Porzingis will be re-evaluated next week 2:20 Can the Celtics win without Kristaps Porzingis? 1:43 White on being in ‘the zone': ‘It's unreal … the basket gets huge' 0:48 White credits Mazzulla, teammates for confidence in big moments 0:38 Al Horford not happy with Bam Adebayo after Tatum hit