The Pacific Coast League is a hitter-friendly league thanks to its relatively high altitude. The thinner, hotter air provides less resistance for balls, meaning that pitches have less spin on them, making them less effective, and that balls hit in the air have less drag, making them carry further. In addition, the sun baking the playing field results in harder and dryer surfaces, making fielding more difficult and inflating BABIPs and batting averages. As a result, results that are considered good in the PCL would not be considered so elsewhere. The 2003 Las Vegas 51s, then an affiliate of the Los Angeles Dodgers, posted a team ERA of 4.