1b Best case: Lucas Duda and Wilmer Flores provide a formidable platoon in the middle of the batting order.
Worst case: Back woes send Duda to the DL, and the front office searches for James Loney‘s telephone number.
2b Best case: Neil Walker has an injury free season and the switch-hitter improves his production against right-handers.
Worst case: Walker joins Duda in the back and spine ward of the hospital.
3b Best case: David Wright recovers enough from his various health woes to provide respectable production in the field and at bat.
Worst case: Wright recovers enough from his various health woes to play some, but not play well.
RF Best case: After a sizzling spring training Michael Conforto settles in and plays like he did the first two months of 2016.
Worst case: Jay Bruce plays the position, and he performs like he did the last two months of 2016.
LF Best case: A monster year for Yoenis Cespedes, topped off by the MVP award and a ring.
Worst case: Cespedes quits baseball to become a golf pro.
SP Best case: No lengthy DL stays for the rotation, and Noah Syndergaard‘s ramped up off-season workout regimen does lead to increased fast ball velocity and a few tape measure home runs from him as well.
Worst case: Starters drop like flies, including Noah Syndergaard, whose increased velocity leads to an overworked elbow.
RP Best case: Jeurys Familia receives a reasonable suspension, works his way into form and is stronger than usual at the end of the season due to the extra rest.
Worst case: Familia gets a longer suspension, is rusty when he finally returns and never hits peak performance.
C Best case: Travis d’Arnaud‘s spectacular Grapefruit League play continues during the regular season as he contends for the triple crown.
Worst case: A series of on-field injuries means d’Arnaud spends more time at the Hospital for Special Surgery than on the field.
Admittedly a few of the scenarios are far fetched, but anything realistically close to the best case scenarios would likely mean a pennant, while a record based on the worst case scenarios would mean a losing season.