The serve and volley player?
Second serve? the serve has slowed down a bit. Additionally, down the line returns early in the match, will slow a player’s progress to the net, leaving the crosscourt return more available late in the match, when pressures mount and high percentage tactics become more desirable. A slow player is vulnerable to the crosscourt return as it leaves angles in front of them. A fast one is vulnerable down the lines as their vertical speed makes lateral movement more difficult. Proximity to the net also dictates the form of the passing shot. If the volleyer is too close, it means hit down the line or lob, too far means pass with an angle or dipping shots at the feet. Lastly, the most obvious play is to play the weaker volley side when in trouble or on big points, or you might even set up your opponent to hit the first volley to your better passing shot side. Most players develop a pattern on critical points over their career and this should be studied prior to match-play, as foreknowledge will lead to easily predicted ploys and a greater ability to win the big points.