Buster Posey, Justin Upton must-starts in Sunday's Daily Fantasy

SI's FanNation app has arrived, offering daily fantasy sports games that let you put your skills on the line for money or just for bragging rights, leading off with the launch of Baseball Throwdown. Every day, SI's Michael Beller will release his lineup for that day's Baseball Throwdown contest and offer up other picks to get your team ready for the day's slate of games. Download the FanNation app today and get started challenging your friends.

Pitcher

Hyun-jin Ryu, Dodgers (@ Padres) – Ryu will make his return to the mound on Sunday after spending two weeks on the disabled list with a leg injury. He couldn’t have picked a better opponent or setting, as he draws the Padres at Petco Park. Despite the fact that San Diego has won five of its last six games, in three starts against the Padres this season, Ryu has allowed a total of one run on nine hits with 19 strikeouts in 19 innings. He should be able to continue his success against the team with the worst offense in the majors.

Infielder

Buster Posey, Giants (vs. Brewers, Kyle Lohse) – Posey has been one of the hottest hitters in baseball of late. He’s 20-for-44 with five homers and 13 RBI in his last 10 games. He’s slashing an impressive .288/.344/.449 against righties this year, though he’s 0-for-5 with three walks against Lohse in his career.

Outfielder

Justin Upton, Braves (vs. Marlins, Nathan Eovaldi) – Upton has been right alongside Posey as one of the most productive hitters in the last two weeks. He is 20-for-59 with five dingers and 19 RBI in his last 15 games. He also absolutely loves hitting at Turner Field, slashing .322/.410/.626 with 17 homers and 50 RBI at home this season.

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Pitchers

Tanner Roark, Nationals (@ Mariners) – Roark has allowed just six runs and fanned 14 batters in his last 25 2/3 innings, a stretch covering four starts.

Madison Bumgarner, Giants (vs. Brewers) – Bumgarner is coming off a dominant outing against the Rockies in which he flirted with a perfect game, losing it in the 8th inning. He finished instead with a complete game, one-hit shutout and struck out 13 batters.

Infielders

Victor Martinez, Tigers (@ White Sox, Jose Quintana) – Martinez is 13-for-33 with three homers and seven RBI in his last eight games.

Jose Abreu, White Sox (vs. Tigers, Rick Porcello) – Abreu is 20-for-38 with a pair of homers on his current 11-game hitting streak.

Outfielders

Matt Holliday, Cardinals (vs. Cubs, Travis Wood) – Holliday is hitting .298 (14-for-47) with three homers in his last 12 games.

Jayson Werth, Nationals (@ Mariners, Hisashi Iwakuma) – Werth has homered in each of his last two games and is riding a modest four-game hitting streak.