Luke Donald and Russell Knox one shot off 

Heritage lead

Luke Donald and Russell Knox are one shot off the lead at the RBC Heritage at Hilton Head in South Carolina.

Former world number one Donald, 38, shared the lead after the opening round but a level-par round of 71 for the Englishman on Friday saw him reach halfway on five under at Hilton Head.
Scotland's Knox, 30, shot a six-under 65 to join Donald in tied fourth.
World number one Jason Day and Americans Kevin Chappell and Charley Hoffman share the lead on six under.
Knox, who won his first PGA tournament at the WGC-HSBC Champions event in November, shot eight birdies in his 66, the best round of the day.
Donald is without a PGA or European Tour win since 2012, but was on two under for his round heading into the back nine before double bogeying the par-three 14th.
American Patton Kizzire sank a 41-foot putt to make birdie on the 18th and join Knox and Donald on five under par.
England's Greg Owen and Ian Poulter made the cut, but Paul Casey and Matthew Fitzpatrick missed out on three over par.

 HALFWAY SCOREBOARD
indicates golf ball usage

	POS	MOV	PLAYER	OVERALL	THRU	RND	R1	R2	R3	R4	TOT
	T1	6	Chappell, Kevin	-6	F	-3	68	68			136
	T1	2	Day, Jason	-6	F	-2	67	69			136
	T1	6	Hoffman, Charley	-6	F	-3	68	68			136
	T4	3	Donald, Luke	-5	F	E	66	71			137
	T4	11	Kizzire, Patton	-5	F	-3	69	68			137
	T4	54	Knox, Russell *	-5	F	-6	72	65			137
	T7	51	Kirk, Chris *	-4	F	-5	72	66			138
	T7	4	Kuchar, Matt *	-4	F	E	67	71			138
	T7	4	Lingmerth, David	-4	F	E	67	71			138
	T7	-	McNeill, George *	-4	F	-1	68	70			138
	T11	25	Barnes, Ricky *	-3	F	-3	71	68			139
	T11	14	Burgoon, Bronson *	-3	F	-2	70	69			139
	T11	14	DeChambeau, Bryson	-3	F	-2	70	69			139
	T11	4	Delaet, Graham	-3	F	-1	69	70			139
	T11	47	Glover, Lucas *	-3	F	-4	72	67			139
	T11	47	Henley, Russell	-3	F	-4	72	67			139
	T11	14	Hoffmann, Morgan	-3	F	-2	70	69			139
	T11	25	Johnson, Zach *	-3	F	-3	71	68			139
	T11	14	Kelly, Jerry *	-3	F	-2	70	69			139
	T11	25	Kokrak, Jason *	-3	F	-3	71	68			139
	T21	15	Baddeley, Aaron	-2	F	-2	71	69			140
	T21	6	Blair, Zac *	-2	F	E	69	71			140
	T21	15	Campbell, Chad *	-2	F	-2	71	69			140
	T21	18	Finau, Tony *	-2	F	+2	67	73			140
	T21	20	Grace, Branden	-2	F	+3	66	74			140
	T21	83	Horschel, Billy	-2	F	-5	74	66			140
	T21	6	McGirt, William *	-2	F	E	69	71			140
	T21	4	Molder, Bryce	-2	F	-1	70	70			140
	T21	15	Pettersson, Carl *	-2	F	-2	71	69			140
	T21	14	Si-Woo, Kim *	-2	F	+1	68	72			140
	T21	37	Summerhays, Daniel	-2	F	-3	72	68			140
	T21	37	Wheatcroft, Steve *	-2	F	-3	72	68			140
	T33	18	Haas, Bill	-1	F	+1	69	72			141
	T33	53	List, Luke *	-1	F	-3	73	68			141
	T33	25	Noh, Seung-Yul *	-1	F	-2	72	69			141
	T33	25	Ogilvy, Geoff	-1	F	-2	72	69			141
	T33	26	Wagner, Johnson	-1	F	+2	68	73			141
	T33	8	Weekley, Boo *	-1	F	E	70	71			141
	T39	65	Crane, Ben *	E	F	-3	74	68			142
	T39	32	Levin, Spencer *	E	F	+3	68	74			142
	T39	47	Love III, Davis *	E	F	-2	73	69			142
	T39	3	Singh, Vijay *	E	F	E	71	71			142
	T39	19	Stanley, Kyle *	E	F	-1	72	70			142
	T39	3	Stefani, Shawn *	E	F	E	71	71			142
	T39	19	Thomas, Justin *	E	F	-1	72	70			142
	T39	24	Toms, David	E	F	+2	69	73			142
	T39	19	van Aswegen, Tyrone *	E	F	-1	72	70			142
	T39	19	Varner III, Harold	E	F	-1	72	70			142
	T39	19	Wilcox, Will *	E	F	-1	72	70			142
	T50	54	Bohn, Jason *	+1	F	-2	74	69			143
	T50	69	Dufner, Jason *	+1	F	-4	76	67			143
	T50	8	Els, Ernie *	+1	F	E	72	71			143
	T50	14	Gonzales, Andres *	+1	F	+1	71	72			143
	T50	8	Herman, Jim	+1	F	E	72	71			143
	T50	14	Kim, Meen-Whee	+1	F	+1	71	72			143
	T50	8	Kisner, Kevin *	+1	F	E	72	71			143
	T50	36	Knost, Colt *	+1	F	-1	73	70			143
	T50	14	Leishman, Marc	+1	F	+1	71	72			143
	T50	35	Molinari, Francesco *	+1	F	+3	69	74			143
	T50	8	Owen, Greg	+1	F	E	72	71			143
	T50	36	Simpson, Webb	+1	F	-1	73	70			143
	T50	14	Villegas, Camilo	+1	F	+1	71	72			143
	T63	27	Aldridge, Tyler *	+2	F	+2	71	73			144
	T63	27	Brown, Scott	+2	F	+2	71	73			144
	T63	27	Fathauer, Derek	+2	F	+2	71	73			144
	T63	56	Gomez, Fabian	+2	F	+5	68	76			144
	T63	27	Hadwin, Adam	+2	F	+2	71	73			144
	T63	48	Howell III, Charles	+2	F	+4	69	75			144
	T63	27	Iwata, Hiroshi *	+2	F	+2	71	73			144
	T63	51	Kim, Michael	+2	F	-2	75	69			144
	T63	23	Leonard, Justin	+2	F	E	73	71			144
	T63	23	MacKenzie, Will *	+2	F	E	73	71			144
	T63	38	Martin, Ben *	+2	F	+3	70	74			144
	T63	23	Na, Kevin	+2	F	E	73	71			144
	T63	27	Palmer, Ryan	+2	F	+2	71	73			144
	T63	5	Poulter, Ian	+2	F	+1	72	72			144
	T63	38	Reavie, Chez	+2	F	+3	70	74			144
	T63	27	Senden, John *	+2	F	+2	71	73			144
	T63	27	Stroud, Chris	+2	F	+2	71	73			144
	T63	23	Taylor, Nick	+2	F	E	73	71			144
	T63	38	Taylor, Vaughn *	+2	F	+3	70	74			144
	T63	5	Wilson, Mark	+2	F	+1	72	72			144
The following players failed to make the cut
	CUT	-	Barber, Blayne	+3			70	75			145
	CUT	-	Casey, Paul *	+3			75	70			145
	CUT	-	Cink, Stewart	+3			73	72			145
	CUT	-	de Jonge, Brendon *	+3			71	74			145
	CUT	-	Fitzpatrick, Matthew	+3			72	73			145
	CUT	-	Hadley, Chesson	+3			72	73			145
	CUT	-	Hahn, James	+3			72	73			145
	CUT	-	Hicks, Justin *	+3			76	69			145
	CUT	-	Maggert, Jeff	+3			73	72			145
	CUT	-	Malnati, Peter	+3			73	72			145
	CUT	-	Pinckney, Scott	+3			68	77			145
	CUT	-	Roach, Wes *	+3			74	71			145
	CUT	-	Ruffels, Ryan *	+3			75	70			145
	CUT	-	Castro, Roberto *	+4			75	71			146
	CUT	-	Hearn, David	+4			72	74			146
	CUT	-	Jaidee, Thongchai	+4			76	70			146
	CUT	-	Choi, K.J.	+5			70	77			147
	CUT	-	Gore, Jason *	+5			72	75			147
	CUT	-	Lee, Danny *	+5			72	75			147
	CUT	-	McDowell, Graeme	+5			74	73			147
	CUT	-	Saunders, Sam *	+5			76	71			147
	CUT	-	Snedeker, Brandt	+5			73	74			147
	CUT	-	Streb, Robert	+5			72	75			147
	CUT	-	Appleby, Stuart *	+6			69	79			148
	CUT	-	Duke, Ken *	+6			74	74			148
	CUT	-	Harman, Brian	+6			73	75			148
	CUT	-	Jones, Matt *	+6			76	72			148
	CUT	-	Kang, Sunghoon *	+6			74	74			148
	CUT	-	Lovemark, Jamie *	+6			74	74			148
	CUT	-	Overton, Jeff	+6			74	74			148
	CUT	-	Sabbatini, Rory *	+6			71	77			148
	CUT	-	Allenby, Robert	+7			73	76			149
	CUT	-	Marino, Steve	+7			72	77			149
	CUT	-	Swafford, Hudson *	+7			76	73			149
	CUT	-	Curran, Jon	+8			73	77			150
	CUT	-	Gay, Brian	+8			73	77			150
	CUT	-	Collins, Chad *	+9			73	78			151
	CUT	-	Hubbard, Mark *	+9			73	78			151
	CUT	-	Mitchum, Kelly	+9			76	75			151
	CUT	-	O'Hair, Sean	+9			75	76			151
	CUT	-	Ortiz, Carlos *	+9			72	79			151
	CUT	-	Reifers, Kyle	+9			77	74			151
	CUT	-	Stegmaier, Brett	+9			76	75			151
	CUT	-	Todd, Brendon *	+9			76	75			151
	CUT	-	Henry, J.J.	+12			74	80			154
	CUT	-	Steele, Brendan *	+12			76	78			154
	WD	-	Gainey, Tommy *	E			69	46			115
	WD	-	English, Harris *	+6			77				77
	WD	-	Weir, Mike *	+7			78				78
	WD	-	Compton, Erik	+15			81	40			121