There are numerous factors to consider, including the ball, the pitch, and a player's mentality. Top-order batters are among the most proficient in the XI and bat during the trickiest period, namely against the new ball and the frontline bowlers. Over time, the ball becomes softer and rougher and the pitch deteriorates, providing grip and movement for spin bowlers. Middle-order batters, therefore, are ideally good players of spin and strong defensively. Opening batters also face the physical and mental challenge of getting little rest between bowling and batting innings, and being prepared to bat for long periods of time.