Steamer optimistically projects Chris Sale, David Price and Nathan Eovaldi to combine for 489 innings in 2020 with a combined 4.0 WAR higher than the trio posted last season.
https://www.fangraphs.com/projections.aspx?pos=all&stats=pit&type=steamer&team=3&lg=all&players=0
... which is good news for a club trying to improve on an 84-win season that left the Sox 12 games behind the second Wild Card slot.
However, regression works in both directions as evidenced by these 2019 WAR totals and Steamer 2020 WAR projections:
C Christian Vazquez (3.5, 2.8)
1B Michael Chavez (0.7, 0.9)*
2B Jose Peraza (-0.6, 0.6)*
SS Xander Bogaerts (6.8, 4.8)
3B Rafael Devers (5.9, 4.7)
RF Mookie Betts (6.6, 6.6)
CF Jackie Bradley Jr. (1.4, 2.0)
LF Andrew Benintendi (2.0, 2.6)
DH J.D. Martinez (3.2, 3.6)
SP Chris Sale (3.6, 4.9)
SP David Price (2.3, 2.6)
SP Eduardo Rodriguez (3.7, 2.8)
SP Nathan Eovaldi (1.9, 1.6)
SP Martin Perez (1.9, 1.6)**
RP Brandon Workman (2.1, 0.5)
RP Matt Barnes (1.3, 1.0)
* last season the Red Sox got a negative 0.4 fWAR from first base and 0.0 fWAR from second base
** last season Rick Porcello posted 1.8 fWAR for the Red Sox