A pair of popular ESPNers find new work, as you can see them on Thursday's during
Nascar Race Hub and Fridays/Saturdays pre-race coverage at the track site (all coverage airs on FS1, except for any college basketball conference tournaments in mid-March and the baseball playoffs in October--where it will shift to FS2).
Czarniak comes by way of HLN, where she did the sports on a part-time basis during
Morning Express with Robin Meade.
This move makes perfect sense since both ladies covered Nascar in addition to IndyCar when ESPN had them as key properties at that time:
http://www.foxsports.com/presspass/latest-news/2019/02/05/fox-nascar-rounds-out-2019-studio-roster-with-addition-of-hosts-lindsay-czarniak-and-sara-walsh