Teams that need to go all-in at the trade deadline

With just one week to go before the trade deadline, teams have been sorted into buyers and sellers. Usually the sellers are quite clear, but the buyers might have different levels of desperation. Some teams are trying to end playoff droughts. Others might see their window of contention closing soon. One team might not want to risk a potential World Series team on a one-game wild-card game if at all possible. The teams below are the clubs that have the greatest need to buy right now before they risk falling out of contention and potentially waste a great season.