Former Clinton LumberKings outfielder Alex Jackson was traded to the Atlanta Braves on Monday. (Photo by Craig Wieczorkiewicz/The Midwest League Traveler)

The Seattle Mariners continued to stay active in the trade market Monday, sending former top prospect Alex Jackson and a player to be named later to the Atlanta Braves for pitching prospects Max Povse and Rob Whalen.

Despite being the No. 6 overall draft pick in 2014, Jackson has yet to advance past Low-A, topping out in the Midwest League thus far. He started the 2015 season with the Clinton LumberKings, but batted only .157 with 0 HR and 13 RBI in 28 MWL games before the Mariners sent him to extended spring training. He finished the 2015 season with the Everett AquaSox of the short-season Northwest League, where he batted .239 with 8 HR and 25 RBI in 48 games.

Jackson started the 2016 season back in extended spring training — an atypical assignment for a first-round position player beginning his second full season as a pro, as Baseball America noted in its trade analysis here — before returning to the LumberKings in May. His power numbers improved with 11 HR and 20 doubles to go along with 55 RBI in 92 games, but Jackson still batted only .243 and struck out 103 times.

Neither Povse nor Whalen pitched in the Midwest League.

Volquez agrees to deal with Marlins

RHP Edinson Volquez reportedly agreed to a 2-year, $22 million deal with the Miami Marlins on Monday. He pitched for the Kansas City Royals in 2016, going 10-11 with a 5.37 ERA, 139 strikeouts and 76 walks in 189.1 innings (34 starts). He gave up 113 earned runs, the most by a pitcher in the American League.

As a Texas Rangers prospect in 2004, he went 4-4 with a 4.21 ERA, three saves, 74 strikeouts and 27 walks in 87.2 IP (21 games/15 starts) for the LumberKings. He also made two rehab appearances with the Dayton Dragons in 2010, when he was a pitcher for the Cincinnati Reds. He struck out 19 batters in 13 IP for the Dragons.