According to a report from Bob Nightengale of USA Today, the Mariners are expected to look for upgrades in July, but how will they hold up until we get there?

Four teams are reported to be the most aggressive buyers, ahead of this year's MLB trade deadline. The deadline is July 31.

The Mariners have holes to fill, and are likely to try to make a splash during this summer’s trade deadline. Here are five early trade targets to keep an eye on.