Big Boppers so far in 2016 ... and some notable absentees.

David Ortiz is the biggest bopper so far in 2016. Offensive WAR should probably not be included but it's is, which puts the diminutive Jose Altuve among the big boys. Below the top ten lists for oWAR, SLG, TB, HR is a matrix with points for prominent batters: rank 1 gets 10 points, 2 gets 9 points, etc.

Offensive WAR  s c a p y
1.	Altuve (HOU)	3.9
2.	Trout (LAA)	3.8
3.	Bogaerts (BOS)	3.8
4.	Donaldson (TOR)	3.4
5.	Ortiz (BOS)	3.3
6.	Machado (BAL)	3.2
7.	Carpenter (STL)	3.2
8.	Cano (SEA)	3.1
9.	Ozuna (MIA)	3.0
10.	Bradley (BOS)	2.9

Slugging %  s c a p y
1.	Ortiz (BOS)	.697
2.	Machado (BAL)	.605
3.	Duvall (CIN)	.600
4.	Arenado (COL)	.588
5.	Saunders (TOR)	.586
6.	Bruce (CIN)	.585
7.	Cespedes (NYM)	.584
8.	Ozuna (MIA)	.578
9.	Murphy (WSN)	.575
10.	Beltran (NYY)	.573

Total Bases  s c a p y
1.	Ortiz (BOS)	168
2.	Cano (SEA)	166
3.	Machado (BAL)	164
4.	Betts (BOS)	162
5.	Arenado (COL)	161
6.	Trumbo (BAL)	158
7.	Ozuna (MIA)	156
	Altuve (HOU)	156
9.	Bogaerts (BOS)	154
	Murphy (WSN)	154

Home Runs  s c a p y
1.	Duvall (CIN)	21
	Frazier (CHW)	21
	Trumbo (BAL)	21
	Arenado (COL)	21
5.	Beltran (NYY)	19
	Encarnacion (TOR)	19
	Cano (SEA)	19
8.	Ortiz (BOS)	18
	Cruz (SEA)	18
	Cespedes (NYM)	18
	Longoria (TBR)	18
	Story (COL)	18
	Carter (MIL)	18

batter	oWAR	SLG	TB	HR	points		rank	points
Ortiz	5	1	1	8	29		1	10
Arenado		4	5	1	23		2	9
Machado	6	2	3		22		3	8
Cano	8		2	5	18		4	7
Altuve	1		7		14		5	6
Cespedes	7			5	10		6	5
Ozuna	9	8	7		9		7	4
Beltran		10		5	7		8	3
Murphy		9	9		4		9	2
							10	1

Notable by their absence:
Chris Davis: 10th in Runs & BB but 3rd in SO; OPS+ 118, 16 HR; signed big free agent contract before 2016 season.
Jason Heyward: OPS+ 79, 4 HR; signed biggest free agent contract before 2016 season; never a big bopper.
Miguel Cabrera: OPS+ 150, 16 HR; just not among 2016 big boppers. 2012 & 2013 AL MVP.
Mike Trout: OPS+ 156 (8), 0WAR 3.8 (2) behind Altuve, 14 HR. 2014 AL MVP.
Bryce Harper: OPS+ 135, 15 HR, 57 BB (2). 2015 NL MVP.
Andew McCutchen: OPS+ 93, 10 HR. 2013 NL MVP. Could be great value in mid season trade.

And for some additional perspective, top ten in Isolated Power:

Rk	Player	ISO	Year	Age	Tm	Lg	G	PA	AB	R	H	2B	3B	HR	RBI	BB	IBB	SO	HBP	SH	SF	GDP	SB	CS	BA	OBP	SLG	OPS	Pos
1	David Ortiz	.357	2016	40	BOS	AL	66	281	241	33	82	30	1	18	60	38	9	40	1	0	1	10	2	0	.340	.431	.697	1.128	*D/H
2	Adam Duvall	.338	2016	27	CIN	NL	68	257	240	40	63	16	1	21	51	11	0	70	2	0	3	3	2	3	.263	.297	.600	.897	*7/3H95
3	Jay Bruce	.304	2016	29	CIN	NL	67	275	253	43	71	17	6	16	55	18	3	57	2	0	2	5	3	0	.281	.331	.585	.916	*9/8D
4	Yoenis Cespedes	.294	2016	30	NYM	NL	65	260	231	39	67	12	1	18	44	25	2	61	2	0	2	6	1	1	.290	.362	.584	.946	*87/HD
5	Nolan Arenado	.292	2016	25	COL	NL	71	311	274	51	81	15	1	21	61	33	3	35	2	0	2	7	1	3	.296	.373	.588	.961	*5
6	Manny Machado	.288	2016	23	BAL	AL	67	300	271	50	86	27	0	17	42	26	6	53	2	0	1	4	0	3	.317	.380	.605	.985	*65
7	Carlos Beltran	.286	2016	39	NYY	AL	68	266	248	39	71	14	0	19	51	13	1	53	2	0	3	9	0	0	.286	.323	.573	.896	*9D/H
8	Josh Donaldson	.286	2016	30	TOR	AL	72	321	269	61	75	18	4	17	46	47	2	59	3	1	1	5	5	0	.279	.391	.565	.956	*5/D
9	Jake Lamb	.283	2016	25	ARI	NL	71	272	240	36	67	17	3	15	47	28	1	65	3	0	1	6	3	1	.279	.360	.563	.923	*5H
10	Michael Saunders	.283	2016	29	TOR	AL	65	268	237	37	72	18	2	15	32	27	0	70	3	0	1	7	0	2	.304	.381	.586	.967	*7/H8

ISO ranks of some others: Ozuna 20, Cano 21, Chris Davis 25, Cabrera 27, Harper 30, Murphy 37, Trout 38, McCutchen 97 with .162; Heyward has .098 but not enough PA to be ranked.