Overnight ratings hit a season-low for NASCAR on FOX.

Sunday’s NASCAR Sprint Cup STP 500 from Martinsville (VA) earned a 3.8 overnight rating on FOX, down 5% from last year (4.0), and down a tick from 2012 (3.9). Excluding rainouts, the 3.8 is the lowest ever for the spring Martinsville race on FOX (2001, 2003-present).

The 3.8 is also the lowest for any Sprint Cup telecast this season, falling below the previous mark of 4.0 set the previous week at Fontana. So far this season, all six NASCAR Sprint Cup races have had declines in overnights compared to last year.

Despite the lower numbers, NASCAR was easily the top non-NCAA Tournament draw of the weekend on broadcast.

(Sun. overnight from Sports Business Daily)