The 2013 Major League Baseball season is finally underway, and the Seattle Mariners have one series under their belt. In the first two games of the opening set with the Oakland Athletics, the Mariners looked like the hot team of 2013.

In the second half of the series, fans were reminded why this team has struggled over the last few seasons.

It is obviously difficult to make an extended judgment on a team after one series, but there are some things that immediately stand out about this squad. Some results from the series were positive, while others are reasons for concern.

This team may look very different after a month of play, but here are five lessons from the opening series between the Mariners and the A’s.

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