Rain has postponed by the Nascar Sprint Cup Series Samsung Mobile 500 @ Texas Motor Speedway and the O'Reilly Auto Parts 300 until Monday. Constant rain on Saturday and Sunday ended all hope of any track activity at the Texas Motor Speedway. The track does take several hours to dry and pit lane will also need to be dryed. The track will be very tricky when the race goes green for the Sprint Cup Series on Monday at 12 noon eastern as all the grip will be gone and the weather conditions for Monday look like cloudy skies with cool temperatures so it should be interesting. The Nascar Nationwide Series O'Reilly Auto Parts 300 is set for 5pm Monday on ESPN2.