The Atlanta Braves dropped their series opener in Seattle to the Mariners, 5-4, on Monday night. They watched as their 4-0 lead was squandered by a five-spot in the bottom of the sixth by the Mariners' bats. There were a few storylines to watch during this game, so we're going to sort through them here. Regardless of the outcome, there is something worth evaluating. Sean Murphy Still Has Some Rust to Shake Off That's not a critique, per se. It's just a reality check after coming off the injured list . He's only been back to live action for a couple of weeks, and the action he saw was essentially an abridged spring training. He struck out twice in his return to the Braves, and he grounded into a double play in the other trip to the plate. If there is anything that could be seen as encouraging, that ground ball came off the bat at 107 mph. Murphy just couldn't get that pitch elevated. Then, there was the use of ABS behind the dish.…