The main difference between pre-match and in-play Bet of the day tennis is the timing of when the bets are placed. Pre-match betting involves placing bets before the match starts, while in-play betting allows bettors to place bets during the match as it is happening.

With pre-match betting, bettors have time to research the players, their recent form, and other factors that may influence the outcome of the match. This type of betting is ideal for those who prefer to take a more analytical approach to betting, and who may not have the time to watch the match live.

In-play betting, on the other hand, allows bettors to take advantage of changes in the match as they happen. Bettors can watch the match live and place bets on outcomes such as the winner of the next game, the total number of games or sets, or the player to win the next point. In-play betting requires a different type of analysis, as bettors must be able to quickly assess the situation and make decisions based on what they see happening in the match.

One of the main benefits of in-play betting is that it allows bettors to hedge their bets or adjust their strategy based on how the match is playing out. For example, if a bettor has placed a pre-match bet on a player to win the match, but that player is struggling in the early stages of the match, they may choose to place an in-play bet on the opponent to win the next game or set in order to mitigate their losses.

Ultimately, the choice between pre-match and in-play betting will depend on a bettor's personal preferences, their level of expertise, and the amount of time they have available to dedicate to betting. Both types of betting offer their own advantages and challenges, and it's up to each bettor to decide which approach is best suited to their needs.